PSA (for the nth time): about:config is not a supported way of configuring Firefox, so if you tweak features with about:config, don't be surprised if those tweaks stop working without warning.

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autoexec 6 days ago | parent | next [-]

Mozilla tells you to use it so it so that seems supported enough to me (example: https://support.mozilla.org/en-US/kb/how-stop-firefox-making...)

That said, they're admittedly terrible about keeping their documentation updated, letting users know about added/depreciated settings, and they've even been known to go in and modify settings after you've explicitly changed them from defaults, so the PSA isn't entirely unjustified.

	▲	ekr____ 6 days ago \| parent [-]
		Ugh. Because they also say: "Two other forms of advanced configuration allow even further customization: about:config preference modifications and userChrome.css or userContent.css custom style rules. However, Mozilla highly recommends that only the developers consider these customizations, as they could cause unexpected behavior or even break Firefox. Firefox is a work in progress and, to allow for continuous innovation, Mozilla cannot guarantee that future updates won’t impact these customizations." https://support.mozilla.org/en-US/kb/firefox-advanced-custom...

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tim333 4 days ago | parent | prev [-]

Kind of an aside, I mostly use Chrome but I thought I'd give Firefox a go again, Everyone says use tree style tabs but I couldn't get them to display properly without going to about:config to enable custom css and creating a new css file somewhere deep in the file system. It's stuff like that that makes everyone use Chrome.