# Looking for a specific "about:config" values to hide some warnings during development

**URL:** <https://discourse.mozilla.org/t/looking-for-a-specific-about-config-values-to-hide-some-warnings-during-development/122938>\
**Category:** Development\
**Created:** [September 27, 2023, 8:57am UTC](https://discourse.mozilla.org/t/looking-for-a-specific-about-config-values-to-hide-some-warnings-during-development/122938 "2023-09-27T08:57:45Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![juraj.masiar](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/juraj.masiar/32/30587_2.png) [@juraj.masiar](https://discourse.mozilla.org/u/juraj.masiar)\
**Post date:** [September 27, 2023, 8:57am UTC](https://discourse.mozilla.org/t/looking-for-a-specific-about-config-values-to-hide-some-warnings-during-development/122938/1 "2023-09-27T08:57:45Z")

</div>

Specifically, I would like to disable:

- “Access Your Hidden Tabs”
- “Your homepage has changed.”
- “Your new tab has changed.”

This is what it looks like:  
[https://mega.nz/file/IWJA0ZKA#aM7anplcCVH0xqnFREf3arYcJcSwdkQ\_O5ccBEFHB\_o](https://mega.nz/file/IWJA0ZKA#aM7anplcCVH0xqnFREf3arYcJcSwdkQ_O5ccBEFHB_o)

Is there some way I can look for these strings in Firefox source code and then somehow find the pref in the about:config page?

**PS:**  
If you are addon developer, you may be interested in these preferences I’ve managed to find over the years:

```auto
web-ext run 
--firefox="C:\Program Files\Mozilla Firefox ESR\firefox.exe" 
--devtools 
--start-url about:debugging#/runtime/this-firefox 
--pref=extensions.activeThemeID=firefox-compact-dark@mozilla.org 
--pref=browser.theme.toolbar-theme=0 
--pref=devtools.theme=dark 
--pref=browser.toolbars.bookmarks.2h2020=false 
--pref=browser.toolbars.bookmarks.visibility=never 
--pref=devtools.toolbox.selectedTool=webconsole 
--pref=devtools.theme.show-auto-theme-info=false 
--pref=browser.ctrlTab.recentlyUsedOrder=false 
--pref=devtools.webconsole.timestampMessages=true 
--pref=signon.rememberSignons=true 
--pref=browser.tabs.firefox-view=false
--pref=devtools.toolbox.alwaysOnTop=false

```

(when running web-ext, you need to inline all these into one huge line)

EDIT:  
I’ve tried to open about:config and show only changed values, then approve all 3 warnings and compare what has changed and there was nothing.  
So maybe the warnings are not configurable in about:config?