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

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

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:

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?