# Firefox Nightly

**URL:** https://discourse.mozilla.org/c/nightly/237.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 Nightly category](https://discourse.mozilla.org/t/about-the-firefox-nightly-category/16129)

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**Author:** [@mkohler](https://discourse.mozilla.org/u/mkohler)\
**Replies:** 0\
**Last updated:** [June 6, 2017, 9:42pm UTC](https://discourse.mozilla.org/t/about-the-firefox-nightly-category/16129 "2017-06-06T21:42:45Z")

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Use Firefox Nightly, report bugs, build and empower a community of power-users all around the globe, let's discuss all things Nightly here! Useful link about all things Nightly: https://wiki.mozilla.org/Nightly

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## [Issues with dpu scaling and scroll bar, globally](https://discourse.mozilla.org/t/issues-with-dpu-scaling-and-scroll-bar-globally/147515)

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**Author:** [@ziongamerrush\_accessdenied](https://discourse.mozilla.org/u/ziongamerrush_accessdenied)\
**Replies:** 2\
**Last updated:** [September 27, 2026, 7:41pm UTC](https://discourse.mozilla.org/t/issues-with-dpu-scaling-and-scroll-bar-globally/147515 "2026-09-27T19:41:51Z")

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at using any sort of dpi scaling for high resolution or wide monitors the scroll bars causes the grab section to be only one pixel wide, also it needs to have aces to the farthest pixel to the right or left(depending ori…

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## [Can't log into eBay](https://discourse.mozilla.org/t/cant-log-into-ebay/149079)

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**Author:** [@FoxGrump](https://discourse.mozilla.org/u/FoxGrump)\
**Replies:** 0\
**Last updated:** [July 31, 2026, 1:13am UTC](https://discourse.mozilla.org/t/cant-log-into-ebay/149079 "2026-07-31T01:13:46Z")

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Hi, I can’t log into eBay. I’m using Windows 7 and this has probably got something to do with it but what I’m not sure. But I guess it could also have something to do with Norton 360. I was using Firefox 102 (I think) e…

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## [Site ufc.ru error PR\_CONNECT\_RESET\_ERROR](https://discourse.mozilla.org/t/site-ufc-ru-error-pr-connect-reset-error/148641)

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**Author:** [@Mihail](https://discourse.mozilla.org/u/Mihail)\
**Replies:** 1\
**Last updated:** [June 14, 2026, 8:34pm UTC](https://discourse.mozilla.org/t/site-ufc-ru-error-pr-connect-reset-error/148641 "2026-06-14T20:34:32Z")

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Dear developers, Mozilla FireFox cannot open site https://ufc.ru PR\_CONNECT\_RESET\_ERROR

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## [Android 153.0a1 reversed video on some sites](https://discourse.mozilla.org/t/android-153-0a1-reversed-video-on-some-sites/148571)

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**Author:** [@Lint](https://discourse.mozilla.org/u/Lint)\
**Replies:** 1\
**Last updated:** [June 4, 2026, 6:33am UTC](https://discourse.mozilla.org/t/android-153-0a1-reversed-video-on-some-sites/148571 "2026-06-04T06:33:53Z")

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So this is weird, on some sites (ive seen this on reddit and bsky) videos are playing flipped in both the x and y axis. This seems to have been a consequence of the update to 153.0a1 153.0a1 (Build #2016164575), 253b852…

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## [\[Nova Redesign\] Separate option for Panel Gaps matching system theme?](https://discourse.mozilla.org/t/nova-redesign-separate-option-for-panel-gaps-matching-system-theme/148403)

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**Author:** [@dreamersys](https://discourse.mozilla.org/u/dreamersys)\
**Replies:** 0\
**Last updated:** [May 22, 2026, 12:03am UTC](https://discourse.mozilla.org/t/nova-redesign-separate-option-for-panel-gaps-matching-system-theme/148403 "2026-05-22T00:03:03Z")

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Currently testing Nightly on Arch Linux, KDE Plasma + Kwin. Upon testing my normal current theme (the official Pale Lavender theme) with the Title bar option, under my light theme, it- coincidentally, unfortunately- mat…

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## [Android 151.0b1 Update lost all my tabs, DO NOT UPDATE](https://discourse.mozilla.org/t/android-151-0b1-update-lost-all-my-tabs-do-not-update/148099)

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**Author:** [@nullptr](https://discourse.mozilla.org/u/nullptr)\
**Replies:** 4\
**Last updated:** [May 4, 2026, 6:36pm UTC](https://discourse.mozilla.org/t/android-151-0b1-update-lost-all-my-tabs-do-not-update/148099 "2026-05-04T18:36:52Z")

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version 151.0b1 org.mozilla.firefox\_beta This version completely nuked all the tabs I had open on Android. Even sync doesn’t show any of them. Not in history. The appalling quality control over the last few years is e…

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## [Settings menu unuseable](https://discourse.mozilla.org/t/settings-menu-unuseable/148098)

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**Author:** [@alpvax](https://discourse.mozilla.org/u/alpvax)\
**Replies:** 0\
**Last updated:** [April 24, 2026, 5:27pm UTC](https://discourse.mozilla.org/t/settings-menu-unuseable/148098 "2026-04-24T17:27:28Z")

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See screenshot below of my screen when I try to open the browser settings (Samsung S25).

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## [New sidebar history tab is missing recently closed section](https://discourse.mozilla.org/t/new-sidebar-history-tab-is-missing-recently-closed-section/147622)

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**Author:** [@dantob](https://discourse.mozilla.org/u/dantob)\
**Replies:** 0\
**Last updated:** [March 14, 2026, 1:46pm UTC](https://discourse.mozilla.org/t/new-sidebar-history-tab-is-missing-recently-closed-section/147622 "2026-03-14T13:46:56Z")

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Overall I’m really liking the new sidebar functionality compared to the old menu system. But currently the history tab is missing the ability to reopen ‘recently closed tabs’ and ‘recently closed windows’, is this somet…

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## [Nightly builds from APT repository arent available in Dutch, even with l10n](https://discourse.mozilla.org/t/nightly-builds-from-apt-repository-arent-available-in-dutch-even-with-l10n/146650)

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**Author:** [@Mealman1551](https://discourse.mozilla.org/u/Mealman1551)\
**Replies:** 0\
**Last updated:** [December 6, 2025, 12:40pm UTC](https://discourse.mozilla.org/t/nightly-builds-from-apt-repository-arent-available-in-dutch-even-with-l10n/146650 "2025-12-06T12:40:37Z")

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I’m running Debian Sid with the official Mozilla Nightly APT repository. I installed firefox-nightly and firefox-nightly-l10n-nl and selected Dutch in the settings, but the UI stays in English. If I download the Mozilla…

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## [New "Add Note" function in tabs?](https://discourse.mozilla.org/t/new-add-note-function-in-tabs/146563)

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**Author:** [@Pseudoryx](https://discourse.mozilla.org/u/Pseudoryx)\
**Replies:** 1\
**Last updated:** [November 21, 2025, 6:46pm UTC](https://discourse.mozilla.org/t/new-add-note-function-in-tabs/146563 "2025-11-21T18:46:56Z")

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Noticed this new option in my tab context menu a day or two ago. Any documentation related to this feature? I can add and edit the notes, but they don’t seem to show up anywhere to make them really useful.

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## [Weird fonts in websites after changing android system font with root](https://discourse.mozilla.org/t/weird-fonts-in-websites-after-changing-android-system-font-with-root/128358)

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**Author:** [@sh4d0w](https://discourse.mozilla.org/u/sh4d0w)\
**Replies:** 1\
**Last updated:** [September 21, 2025, 2:02pm UTC](https://discourse.mozilla.org/t/weird-fonts-in-websites-after-changing-android-system-font-with-root/128358 "2025-09-21T14:02:52Z")

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After I had changed the system wide font with a magisk module, random fonts appear in all the websites that do not have custom website fonts. The fonts work properly on chromium based browsers but this seems to be an is…

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## [Why does Firefox perform a favicon lookup when the website doesn't request one?](https://discourse.mozilla.org/t/why-does-firefox-perform-a-favicon-lookup-when-the-website-doesnt-request-one/143817)

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**Author:** [@rokejulianlockhart](https://discourse.mozilla.org/u/rokejulianlockhart)\
**Replies:** 1\
**Last updated:** [May 31, 2025, 12:38am UTC](https://discourse.mozilla.org/t/why-does-firefox-perform-a-favicon-lookup-when-the-website-doesnt-request-one/143817 "2025-05-31T00:38:44Z")

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If I visit https://example.com/, I see: GET https://example.com/favicon.ico \[HTTP/3 404 150ms\] GET https://example.com/favicon.ico Status 404 VersionHTTP/3 Transferred1.72 kB (1.26 kB size) Referrer Policystrict-or…

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## [How can I, as a non-WebExtension developer, ascertain what a tab's ID is?](https://discourse.mozilla.org/t/how-can-i-as-a-non-webextension-developer-ascertain-what-a-tabs-id-is/143785)

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**Author:** [@rokejulianlockhart](https://discourse.mozilla.org/u/rokejulianlockhart)\
**Replies:** 3\
**Last updated:** [May 30, 2025, 11:24am UTC](https://discourse.mozilla.org/t/how-can-i-as-a-non-webextension-developer-ascertain-what-a-tabs-id-is/143785 "2025-05-30T11:24:58Z")

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When I was diagnosing bugzilla.mozilla.org/show\_bug.cgi?id=1969259#c3, \[1\] ascertaining which tab to attach to was nigh impossible: My sole workaround thus far has been to close the tab of interest, then reinvoke it,…

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## [What does "Enable"/"Disable" "connection prompt" do?](https://discourse.mozilla.org/t/what-does-enable-disable-connection-prompt-do/141680)

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**Author:** [@rokejulianlockhart](https://discourse.mozilla.org/u/rokejulianlockhart)\
**Replies:** 0\
**Last updated:** [March 21, 2025, 12:11pm UTC](https://discourse.mozilla.org/t/what-does-enable-disable-connection-prompt-do/141680 "2025-03-21T12:11:56Z")

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Context Example

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## ["Open previous windows and tabs" does not work while using profiles](https://discourse.mozilla.org/t/open-previous-windows-and-tabs-does-not-work-while-using-profiles/141562)

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**Author:** [@Explorer99](https://discourse.mozilla.org/u/Explorer99)\
**Replies:** 1\
**Last updated:** [March 19, 2025, 8:32am UTC](https://discourse.mozilla.org/t/open-previous-windows-and-tabs-does-not-work-while-using-profiles/141562 "2025-03-19T08:32:18Z")

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Hello, I am experiencing an issue with Firefox Nightly when using multiple profiles. On each of my profiles, I have enabled the option “Open previous windows and tabs.” On my main profile, the tabs and windows reopen n…

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## [Too much padding in new sidebar tabs (Nightly 137.0a1)](https://discourse.mozilla.org/t/too-much-padding-in-new-sidebar-tabs-nightly-137-0a1/140253)

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**Author:** [@jive](https://discourse.mozilla.org/u/jive)\
**Replies:** 0\
**Last updated:** [February 18, 2025, 11:00am UTC](https://discourse.mozilla.org/t/too-much-padding-in-new-sidebar-tabs-nightly-137-0a1/140253 "2025-02-18T11:00:26Z")

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I just updated to the latest nightly and there is this gap or padding that is happening when using the new vertical tabs (just displaying the icon) Please get rid of this gap! It’s killin’ me! screenshot:

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## [Consistent but random stutter diagnosis](https://discourse.mozilla.org/t/consistent-but-random-stutter-diagnosis/128785)

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**Author:** [@rokejulianlockhart](https://discourse.mozilla.org/u/rokejulianlockhart)\
**Replies:** 3\
**Last updated:** [January 28, 2025, 2:37pm UTC](https://discourse.mozilla.org/t/consistent-but-random-stutter-diagnosis/128785 "2025-01-28T14:37:36Z")

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My Firefox installation constantly stutters at consistent but ultimately apparently random intervals. I recorded https://profiler.firefox.com/from-browser/calltree/?globalTrackOrder=x8x90wx7&hiddenGlobalTracks=1wx3x5x7&h…

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## [Firefox Nightly v135.0a1 (2025-01-06) (64-bit) offers no way to switch containers](https://discourse.mozilla.org/t/firefox-nightly-v135-0a1-2025-01-06-64-bit-offers-no-way-to-switch-containers/138659)

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**Author:** [@tony3](https://discourse.mozilla.org/u/tony3)\
**Replies:** 1\
**Last updated:** [January 7, 2025, 4:16pm UTC](https://discourse.mozilla.org/t/firefox-nightly-v135-0a1-2025-01-06-64-bit-offers-no-way-to-switch-containers/138659 "2025-01-07T16:16:22Z")

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Setting is enabled: I’ve renamed two of the default containers: No icon for containers is displayed either before or after adding two tabs to container General: When a tab in the “General” container is select…

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## [Decompression efficiency compared between tar.bz2 and tar.xz (LZMA)](https://discourse.mozilla.org/t/decompression-efficiency-compared-between-tar-bz2-and-tar-xz-lzma/137593)

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**Author:** [@buhtz](https://discourse.mozilla.org/u/buhtz)\
**Replies:** 1\
**Last updated:** [December 2, 2024, 8:08pm UTC](https://discourse.mozilla.org/t/decompression-efficiency-compared-between-tar-bz2-and-tar-xz-lzma/137593 "2024-12-02T20:08:23Z")

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This is an additional question to this announcement about Firefox switching from tar.bz2 to tar.xz (LZMA). I congratulate on that decision in context of sustainable software development and climate change. I would like…

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## [Top toolbar tab impossible to delete (nightly 132.0a1)](https://discourse.mozilla.org/t/top-toolbar-tab-impossible-to-delete-nightly-132-0a1/135756)

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**Author:** [@Erwan62](https://discourse.mozilla.org/u/Erwan62)\
**Replies:** 2\
**Last updated:** [September 25, 2024, 9:45am UTC](https://discourse.mozilla.org/t/top-toolbar-tab-impossible-to-delete-nightly-132-0a1/135756 "2024-09-25T09:45:56Z")

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After the last update, a new tool appeared in the toolbar: “list all tabs”. I didn’t see any use for this tool, so to avoid overloading my bars, I decided to remove it (as well as the “new tab” tool). I was able to del…

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## [Bug dans la barre latéral (Nightly 132.0a1)](https://discourse.mozilla.org/t/bug-dans-la-barre-lateral-nightly-132-0a1/135755)

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**Author:** [@Erwan62](https://discourse.mozilla.org/u/Erwan62)\
**Replies:** 0\
**Last updated:** [September 13, 2024, 2:01pm UTC](https://discourse.mozilla.org/t/bug-dans-la-barre-lateral-nightly-132-0a1/135755 "2024-09-13T14:01:02Z")

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## [Customized DNS seems incomprehensible to me](https://discourse.mozilla.org/t/customized-dns-seems-incomprehensible-to-me/135754)

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**Author:** [@Erwan62](https://discourse.mozilla.org/u/Erwan62)\
**Replies:** 0\
**Last updated:** [September 13, 2024, 1:58pm UTC](https://discourse.mozilla.org/t/customized-dns-seems-incomprehensible-to-me/135754 "2024-09-13T13:58:51Z")

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Hello I’m trying to set up the use of a custom DNS and I don’t understand how to do it. What should I put in the only box provided to fill in this DNS? Normally, I should provide IPs and Https addresses.

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## [Bookmarks need to be compact](https://discourse.mozilla.org/t/bookmarks-need-to-be-compact/135524)

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**Author:** [@Erwan62](https://discourse.mozilla.org/u/Erwan62)\
**Replies:** 0\
**Last updated:** [September 5, 2024, 8:33am UTC](https://discourse.mozilla.org/t/bookmarks-need-to-be-compact/135524 "2024-09-05T08:33:09Z")

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The bookmarks have become much more widely spaced compared with my classic Firefox version. As a result, I don’t see enough of them and the list is too long. I’d like to go back to a really compact version. I’m talkin…

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## [Mon premier avis](https://discourse.mozilla.org/t/mon-premier-avis/135369)

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**Author:** [@Erwan](https://discourse.mozilla.org/u/Erwan)\
**Replies:** 0\
**Last updated:** [August 30, 2024, 11:38am UTC](https://discourse.mozilla.org/t/mon-premier-avis/135369 "2024-08-30T11:38:07Z")

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I gave Nightly a quick try… first impression: well, nothing’s changed … You still can’t customize your Firefox: no compact tabs, no removal of the irritating extensions button, no good side tabs. on the other hand, I h…

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## [Does Firefox support the shebang in JS files?](https://discourse.mozilla.org/t/does-firefox-support-the-shebang-in-js-files/135277)

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**Author:** [@rokejulianlockhart](https://discourse.mozilla.org/u/rokejulianlockhart)\
**Replies:** 2\
**Last updated:** [August 29, 2024, 7:07pm UTC](https://discourse.mozilla.org/t/does-firefox-support-the-shebang-in-js-files/135277 "2024-08-29T19:07:43Z")

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https://stackoverflow.com/revisions/76883115/1#:~:text=%23!/usr/bin/env%20node,ecmascript%20in%20the%20TC39%20meeting explains that ECMAScript supports it. VSCode certainly correctly interprets it as a comment. Consequen…

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## [Per-profile proxy](https://discourse.mozilla.org/t/per-profile-proxy/135278)

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**Author:** [@rootxy](https://discourse.mozilla.org/u/rootxy)\
**Replies:** 2\
**Last updated:** [August 27, 2024, 2:40am UTC](https://discourse.mozilla.org/t/per-profile-proxy/135278 "2024-08-27T02:40:08Z")

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When create a new container, can we also set a proxy specific for that container as well?

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## [\[Solved\] Window decoration / theme on Linux](https://discourse.mozilla.org/t/solved-window-decoration-theme-on-linux/67006)

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**Author:** [@mihamina](https://discourse.mozilla.org/u/mihamina)\
**Replies:** 4\
**Last updated:** [August 14, 2024, 12:45pm UTC](https://discourse.mozilla.org/t/solved-window-decoration-theme-on-linux/67006 "2024-08-14T12:45:35Z")

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Hello, I am using Nightly on Linux (XFCE). Suddenly, the window decoration changed and is not the same as the one I set up for the environment. What setting do I change in order to make it use the environment window d…

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## [Folders with tabs](https://discourse.mozilla.org/t/folders-with-tabs/134588)

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**Author:** [@NiroEnvy](https://discourse.mozilla.org/u/NiroEnvy)\
**Replies:** 1\
**Last updated:** [August 6, 2024, 2:07pm UTC](https://discourse.mozilla.org/t/folders-with-tabs/134588 "2024-08-06T14:07:32Z")

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I come from opera gx. There was functionality there that I could in the sidebar highlight “spaces”. Now there is a container system, but the cookies are isolated. In my case I want “tabbed folders” instead of “bookmarks”…

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## [Why is it not possible to refresh pages with swipe down anymore?](https://discourse.mozilla.org/t/why-is-it-not-possible-to-refresh-pages-with-swipe-down-anymore/134471)

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**Author:** [@koxlc](https://discourse.mozilla.org/u/koxlc)\
**Replies:** 1\
**Last updated:** [August 2, 2024, 6:33pm UTC](https://discourse.mozilla.org/t/why-is-it-not-possible-to-refresh-pages-with-swipe-down-anymore/134471 "2024-08-02T18:33:05Z")

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Looks like swipe down refresh is not working on new version? Why is that? I have three different android devices (Cat, Xperia, Pixel) with Nightly installed and it is not swipe refreshing on everyone. Yes, feature is en…

[Next page](https://discourse.mozilla.org/c/nightly/237.md?page=1)