# Firefox Development

**URL:** https://discourse.mozilla.org/c/firefox-development/178.md

[Latest](https://discourse.mozilla.org/latest.md) · [Categories](https://discourse.mozilla.org/categories.md) · [Tags](https://discourse.mozilla.org/tags.md)

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## [About the Firefox Development category](https://discourse.mozilla.org/t/about-the-firefox-development-category/8715)

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**Author:** [@buluma\_michael](https://discourse.mozilla.org/u/buluma_michael)\
**Replies:** 5\
**Last updated:** [July 28, 2021, 11:22pm UTC](https://discourse.mozilla.org/t/about-the-firefox-development-category/8715 "2021-07-28T23:22:21Z")

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Questions and answers about Firefox browser development. Come help us build the best web browser and the future of the Open Web. You can also email firefox+qanda@mozilla-community.org to post to this category. To contr…

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## [Maliscious ai fake subproceses](https://discourse.mozilla.org/t/maliscious-ai-fake-subproceses/149824)

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**Author:** [@ziongamerrush\_accessdenied](https://discourse.mozilla.org/u/ziongamerrush_accessdenied)\
**Replies:** 1\
**Last updated:** [October 19, 2026, 2:33am UTC](https://discourse.mozilla.org/t/maliscious-ai-fake-subproceses/149824 "2026-10-19T02:33:54Z")

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\>fake subproceses runing bad tasks not requested by user on linux cachy os not required for page load, sub process manager needs user authentication and blacklisting per domain handling also preallocator blocks are nev…

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## [Can FF's superb Reopen Tab / Reopen Closed Window logic be restored, please?](https://discourse.mozilla.org/t/can-ffs-superb-reopen-tab-reopen-closed-window-logic-be-restored-please/123181)

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**Author:** [@FFFan](https://discourse.mozilla.org/u/FFFan)\
**Replies:** 7\
**Last updated:** [October 16, 2026, 10:03pm UTC](https://discourse.mozilla.org/t/can-ffs-superb-reopen-tab-reopen-closed-window-logic-be-restored-please/123181 "2026-10-16T22:03:27Z")

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Dear Mozilla Firefox Team, In FF v116.0 the behavior of the “Undo Close Tab” Keyboard shortcut changed. Previously, one could reopen closed tabs or windows independently using their own respective keyboard shortcuts. …

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## [Accessibility for color blind people? No settings, no rec. extention?](https://discourse.mozilla.org/t/accessibility-for-color-blind-people-no-settings-no-rec-extention/149591)

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**Author:** [@Zaph](https://discourse.mozilla.org/u/Zaph)\
**Replies:** 1\
**Last updated:** [September 28, 2026, 6:16pm UTC](https://discourse.mozilla.org/t/accessibility-for-color-blind-people-no-settings-no-rec-extention/149591 "2026-09-28T18:16:04Z")

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There is currently no help or any recommendations for accessibility improvements in the settings/add-ons, for people with color vision impairments. And if there are, they must be well hidden and buried under tools for im…

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## [The Illusion of Privacy and the Abuse of User Trust](https://discourse.mozilla.org/t/the-illusion-of-privacy-and-the-abuse-of-user-trust/149184)

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**Author:** [@universeoflinux](https://discourse.mozilla.org/u/universeoflinux)\
**Replies:** 2\
**Last updated:** [August 24, 2026, 5:08am UTC](https://discourse.mozilla.org/t/the-illusion-of-privacy-and-the-abuse-of-user-trust/149184 "2026-08-24T05:08:48Z")

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Misleading Default Settings and Violations of the “Privacy by Default” Principle in the Firefox Browser Dear Mozilla Developers and Community, For decades, Mozilla Firefox has built its entire marketing strategy and br…

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## [Stop spamming me everytime theres an update available](https://discourse.mozilla.org/t/stop-spamming-me-everytime-theres-an-update-available/149222)

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**Author:** [@os2face](https://discourse.mozilla.org/u/os2face)\
**Replies:** 0\
**Last updated:** [August 18, 2026, 4:58pm UTC](https://discourse.mozilla.org/t/stop-spamming-me-everytime-theres-an-update-available/149222 "2026-08-18T16:58:49Z")

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I DISABLED FIREFOX AUTO UPDATES BECAUSE ITS F-ING ANNOYING. NOW STOP SPAMMING MY BROWSER EVERY F-ING TIMES THERE’S AN UPDATE AVAILABLE.

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## [Firefox: mouse Back/Forward buttons do not reliably reach page JavaScript](https://discourse.mozilla.org/t/firefox-mouse-back-forward-buttons-do-not-reliably-reach-page-javascript/148988)

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**Author:** [@Master\_N\_Master](https://discourse.mozilla.org/u/Master_N_Master)\
**Replies:** 3\
**Last updated:** [August 15, 2026, 6:58am UTC](https://discourse.mozilla.org/t/firefox-mouse-back-forward-buttons-do-not-reliably-reach-page-javascript/148988 "2026-08-15T06:58:40Z")

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Hello, Firefox and Chromium do not treat mouse side buttons the same way. The physical button codes are: X1 / Browser Back button → MouseEvent.button === 3 X2 / Browser Forward button → MouseEvent.button === 4 The…

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## [CSS Random](https://discourse.mozilla.org/t/css-random/149048)

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**Author:** [@Noah\_S](https://discourse.mozilla.org/u/Noah_S)\
**Replies:** 1\
**Last updated:** [August 2, 2026, 8:15pm UTC](https://discourse.mozilla.org/t/css-random/149048 "2026-08-02T20:15:37Z")

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Are there any plans to implement support for the CSS random() function? I’m a web developer and it would make a browser game I’m making so much simpler.

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## [Keep history and max pages for years in newest version](https://discourse.mozilla.org/t/keep-history-and-max-pages-for-years-in-newest-version/148801)

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**Author:** [@Oldschool297](https://discourse.mozilla.org/u/Oldschool297)\
**Replies:** 1\
**Last updated:** [July 5, 2026, 10:18am UTC](https://discourse.mozilla.org/t/keep-history-and-max-pages-for-years-in-newest-version/148801 "2026-07-05T10:18:59Z")

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Before you could change the max pages. Now i do not see that option, i have tried to change max pages to false but my history keeps deleting. Go to about:config. Type places.history.expiration.max\_pages into the search…

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## [Firefox user experience](https://discourse.mozilla.org/t/firefox-user-experience/75252)

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**Author:** [@peterseinbruder](https://discourse.mozilla.org/u/peterseinbruder)\
**Replies:** 2\
**Last updated:** [June 28, 2026, 10:35am UTC](https://discourse.mozilla.org/t/firefox-user-experience/75252 "2026-06-28T10:35:27Z")

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hi there, i got my first desktop computer in 2003, my first browser was firefox and i stuck with it until around 2016 before switching to chrome. firefox has become the biggest pile of garbage software that i have ever …

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## [Utiq filters in Ublock-origin](https://discourse.mozilla.org/t/utiq-filters-in-ublock-origin/148519)

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**Author:** [@jardindivert](https://discourse.mozilla.org/u/jardindivert)\
**Replies:** 0\
**Last updated:** [May 31, 2026, 10:22am UTC](https://discourse.mozilla.org/t/utiq-filters-in-ublock-origin/148519 "2026-05-31T10:22:45Z")

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Hello. I tried to inject filters relating to the new ‘UTIQ’ system into Ublock-origin. Regardless of the syntax used, UB-o refuses. Here are the injections attempted: ||utiq.com^ ||consenthub.utiq.com^ ||utiqLoader.js$sc…

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## [Native Scroll-Position Sync and Custom Device Groups](https://discourse.mozilla.org/t/native-scroll-position-sync-and-custom-device-groups/148504)

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**Author:** [@ron.katzir](https://discourse.mozilla.org/u/ron.katzir)\
**Replies:** 0\
**Last updated:** [May 29, 2026, 4:10pm UTC](https://discourse.mozilla.org/t/native-scroll-position-sync-and-custom-device-groups/148504 "2026-05-29T16:10:52Z")

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Hello I’m really missing the following features, and considering suggesting them as native features or developing them as extensions myself: Scroll Sync: synchronization of a web page’s reading position across device…

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## [Firefox Enchancement: First-class tab group experience in Firefox](https://discourse.mozilla.org/t/firefox-enchancement-first-class-tab-group-experience-in-firefox/148474)

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**Author:** [@kv-codec](https://discourse.mozilla.org/u/kv-codec)\
**Replies:** 0\
**Last updated:** [May 26, 2026, 7:41pm UTC](https://discourse.mozilla.org/t/firefox-enchancement-first-class-tab-group-experience-in-firefox/148474 "2026-05-26T19:41:36Z")

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I’ve started to actively use tab groups some time ago and I wanna mention that there is space for enchancement at the moment I’m writing this. I’ve noticed that I can’t persistently save tab group (except for the situa…

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## [Firefox ideas: per-profile taskbar icon + saved/visited sites toggle on new tab](https://discourse.mozilla.org/t/firefox-ideas-per-profile-taskbar-icon-saved-visited-sites-toggle-on-new-tab/148340)

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**Author:** [@Doei123456](https://discourse.mozilla.org/u/Doei123456)\
**Replies:** 1\
**Last updated:** [May 18, 2026, 12:32am UTC](https://discourse.mozilla.org/t/firefox-ideas-per-profile-taskbar-icon-saved-visited-sites-toggle-on-new-tab/148340 "2026-05-18T00:32:38Z")

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Hi all, two small ideas that I think would improve the daily Firefox experience: 1. Taskbar icon per profile I have two Firefox profiles, each with its own shortcut pinned to the Windows taskbar. When I open one of tho…

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## [New profiles vs old profiles](https://discourse.mozilla.org/t/new-profiles-vs-old-profiles/146586)

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**Author:** [@hook](https://discourse.mozilla.org/u/hook)\
**Replies:** 3\
**Last updated:** [May 5, 2026, 2:18pm UTC](https://discourse.mozilla.org/t/new-profiles-vs-old-profiles/146586 "2026-05-05T14:18:50Z")

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I am a heavy user of Firefox Profiles. In fact, I maintain a script to make Firefox behave better on KDE Plasma in a multi-Activity set-up, which relies on Firefox Profiles. So I was quite excited to learn that handli…

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## [How can I disable search engines in address bar?](https://discourse.mozilla.org/t/how-can-i-disable-search-engines-in-address-bar/77793)

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**Author:** [@Alman](https://discourse.mozilla.org/u/Alman)\
**Replies:** 11\
**Last updated:** [May 2, 2026, 2:25pm UTC](https://discourse.mozilla.org/t/how-can-i-disable-search-engines-in-address-bar/77793 "2026-05-02T14:25:10Z")

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I deliberately set Firefox to provide a separate search input box to the right of the address bar. This way I can simply disambiguate between performing a search and typing an address manually. When I enter an address i…

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## [Web app for linux version of FF?](https://discourse.mozilla.org/t/web-app-for-linux-version-of-ff/147587)

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**Author:** [@epistemepromeneur](https://discourse.mozilla.org/u/epistemepromeneur)\
**Replies:** 3\
**Last updated:** [May 1, 2026, 11:33am UTC](https://discourse.mozilla.org/t/web-app-for-linux-version-of-ff/147587 "2026-05-01T11:33:28Z")

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In the past (about 4 years) we were able to test the web apps with the linux version of FF. Then Mozilla abandoned this feature. This feature reappeared with the Windows version of FF. Why not reintroduce this feature…

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## [Is there an answer to stopping ABOUT:BLANK?](https://discourse.mozilla.org/t/is-there-an-answer-to-stopping-about-blank/148060)

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**Author:** [@JGC\_TV](https://discourse.mozilla.org/u/JGC_TV)\
**Replies:** 2\
**Last updated:** [April 26, 2026, 3:27pm UTC](https://discourse.mozilla.org/t/is-there-an-answer-to-stopping-about-blank/148060 "2026-04-26T15:27:23Z")

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How to stop a new Tab from opening to an empty TAB that says ABOUT:BLANK instead of the page that I searched for? Really annoying having to close that BLANK TAB and search again, and again. How do I make that stop.

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## [I'm here to say 149 is so bad totally unusable](https://discourse.mozilla.org/t/im-here-to-say-149-is-so-bad-totally-unusable/147911)

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**Author:** [@117649](https://discourse.mozilla.org/u/117649)\
**Replies:** 1\
**Last updated:** [April 22, 2026, 2:30pm UTC](https://discourse.mozilla.org/t/im-here-to-say-149-is-so-bad-totally-unusable/147911 "2026-04-22T14:30:22Z")

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149.0.2 is no better. Tab unloader is completely broken, unloaded tabs won’t be discard but hold in shared web process and reload right away. 148 did it too but won’t be a dick after you kill those shared processes they…

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## [New Tabs Show Blank Page](https://discourse.mozilla.org/t/new-tabs-show-blank-page/147839)

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**Author:** [@supwiddiss](https://discourse.mozilla.org/u/supwiddiss)\
**Replies:** 2\
**Last updated:** [April 12, 2026, 9:39pm UTC](https://discourse.mozilla.org/t/new-tabs-show-blank-page/147839 "2026-04-12T21:39:21Z")

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Firefox just updated a few days ago to version 149.0 on a Windows 11 pc. Prior to, no issues. Now everytime I enter a search term and hit enter. A new tab opens and the page is blank. It only happened after the update. …

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## [When Time support WebHID for Firefox？](https://discourse.mozilla.org/t/when-time-support-webhid-for-firefox/147736)

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**Author:** [@AkarinLiu](https://discourse.mozilla.org/u/AkarinLiu)\
**Replies:** 2\
**Last updated:** [April 12, 2026, 3:18am UTC](https://discourse.mozilla.org/t/when-time-support-webhid-for-firefox/147736 "2026-04-12T03:18:53Z")

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I want to buy Razer Mouse, But I Don’t want using Synapse App. I want to using Synapse Web, Then I can using it on Linux to Avoid using Synapse App.

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## [Search bar is now equal to addres bar](https://discourse.mozilla.org/t/search-bar-is-now-equal-to-addres-bar/147918)

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**Author:** [@DaveShine](https://discourse.mozilla.org/u/DaveShine)\
**Replies:** 0\
**Last updated:** [April 10, 2026, 1:56pm UTC](https://discourse.mozilla.org/t/search-bar-is-now-equal-to-addres-bar/147918 "2026-04-10T13:56:35Z")

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Hi there, for years I always had the search bar enabled because it was easier to use different search engines there (than in the addres bar). I just started typing and then used the TAB key to select the search engine I…

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## [Profile management / multiple profiles in Firefox - ask your questions here!](https://discourse.mozilla.org/t/profile-management-multiple-profiles-in-firefox-ask-your-questions-here/147538)

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**Author:** [@jaredhirsch](https://discourse.mozilla.org/u/jaredhirsch)\
**Replies:** 8\
**Last updated:** [April 4, 2026, 3:25pm UTC](https://discourse.mozilla.org/t/profile-management-multiple-profiles-in-firefox-ask-your-questions-here/147538 "2026-04-04T15:25:00Z")

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Hey all :waving\_hand: Since shipping the multiple profiles feature in Firefox last year, we’ve had some pretty detailed power user questions on Connect, which is a bit of an awkward place to get way into the details. I…

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## [“Always remember site” / “Remember Cookies” option missing](https://discourse.mozilla.org/t/always-remember-site-remember-cookies-option-missing/147837)

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**Author:** [@tfsswag22](https://discourse.mozilla.org/u/tfsswag22)\
**Replies:** 0\
**Last updated:** [April 3, 2026, 8:47pm UTC](https://discourse.mozilla.org/t/always-remember-site-remember-cookies-option-missing/147837 "2026-04-03T20:47:46Z")

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I can no longer find the option to “Always remember site” / “Remember Cookies” (I forget what it said specifically before) that used to be under the shield on the left of the search bar.

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## [Removed option to "Always remember site" / "Remember Cookies"](https://discourse.mozilla.org/t/removed-option-to-always-remember-site-remember-cookies/147836)

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**Author:** [@tfsswag22](https://discourse.mozilla.org/u/tfsswag22)\
**Replies:** 1\
**Last updated:** [April 3, 2026, 8:40pm UTC](https://discourse.mozilla.org/t/removed-option-to-always-remember-site-remember-cookies/147836 "2026-04-03T20:40:51Z")

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I can no longer find the option to “Always remember site” / “Remember Cookies” (I forget what it said specifically before) that used to be under the shield on the left of the search bar.

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## [Details on "built-in VPN" (IP protection)](https://discourse.mozilla.org/t/details-on-built-in-vpn-ip-protection/147748)

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**Author:** [@lxgr](https://discourse.mozilla.org/u/lxgr)\
**Replies:** 0\
**Last updated:** [March 28, 2026, 10:50am UTC](https://discourse.mozilla.org/t/details-on-built-in-vpn-ip-protection/147748 "2026-03-28T10:50:54Z")

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Hi, I’m interested in learning more about the “built-in VPN” feature (internally known as IP protection, I believe). Is there any documentation available other than the support article ( Use built-in VPN in Firefox | Fi…

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## [Multiple profiles - changing the "last used profile becomes default for the profile group" behavior?](https://discourse.mozilla.org/t/multiple-profiles-changing-the-last-used-profile-becomes-default-for-the-profile-group-behavior/147624)

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**Author:** [@jaredhirsch](https://discourse.mozilla.org/u/jaredhirsch)\
**Replies:** 1\
**Last updated:** [March 20, 2026, 4:38pm UTC](https://discourse.mozilla.org/t/multiple-profiles-changing-the-last-used-profile-becomes-default-for-the-profile-group-behavior/147624 "2026-03-20T16:38:46Z")

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A lot of the power user confusion seems to come from the change to default profile behavior. We saw this with flod’s early foxfooding bug (essentially, “where did my profile go…what happened to my profiles.ini”), and I s…

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## [OS Developer Question: Requirements for Porting Firefox to a New Linux-based OS](https://discourse.mozilla.org/t/os-developer-question-requirements-for-porting-firefox-to-a-new-linux-based-os/147623)

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**Author:** [@Efe\_Kaan](https://discourse.mozilla.org/u/Efe_Kaan)\
**Replies:** 1\
**Last updated:** [March 15, 2026, 11:26am UTC](https://discourse.mozilla.org/t/os-developer-question-requirements-for-porting-firefox-to-a-new-linux-based-os/147623 "2026-03-15T11:26:50Z")

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Hello, My name is Efe Kaan Aslan, and I am an independent developer currently working on a new desktop-focused operating system called Tengrux. Tengrux is built on the Linux kernel and targets desktop and laptop hardwa…

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## [Meta Informations of articles, in reader mode](https://discourse.mozilla.org/t/meta-informations-of-articles-in-reader-mode/147386)

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**Author:** [@lm2](https://discourse.mozilla.org/u/lm2)\
**Replies:** 0\
**Last updated:** [February 9, 2026, 11:58pm UTC](https://discourse.mozilla.org/t/meta-informations-of-articles-in-reader-mode/147386 "2026-02-09T23:58:45Z")

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hello, i’d like to know if it would be possible to add the “meta information”. For example, in this article, various info : -subjects of article -name of journalist -date/hour of publication are well shown on the “w…

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## [Chatgpt.com -\> Firefox issue still persists in latest update](https://discourse.mozilla.org/t/chatgpt-com-firefox-issue-still-persists-in-latest-update/147345)

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**Author:** [@strongambition](https://discourse.mozilla.org/u/strongambition)\
**Replies:** 1\
**Last updated:** [February 3, 2026, 4:05pm UTC](https://discourse.mozilla.org/t/chatgpt-com-firefox-issue-still-persists-in-latest-update/147345 "2026-02-03T16:05:13Z")

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Hi everyone, I’m running the latest version of Firefox and I’m still unable to log into my account. The website does not load properly and I can’t click any buttons, not even the login button. I’ve cleared the cache and…

[Next page](https://discourse.mozilla.org/c/firefox-development/178.md?page=1)