topic Firefox 153 doesn't let me change the font size - I reverted to 152!!! in Firefox Labs https://connect.mozilla.org/t5/firefox-labs/firefox-153-doesn-t-let-me-change-the-font-size-i-reverted-to/m-p/135370#M5209 <P>Firefox 153 ignores userChrome.css even with&nbsp;toolkit.legacyUserProfileCustomizations.stylesheets<BR />set to "true".</P><P>After spending two days trying to increase the unreadable font size in tabs and the bookmarks sidebar, I reverted to Firefox 152.</P><P>Created chrome folder, userChrome.css - and now, I can read again!</P><P>What difference can it make to YOU, what size of font do we use??</P><P>The very reason why I have chosen Firefox in the first place is because it is supposed to be 'configurable'!</P><P>By the way - I didn't like the AI stuff either! It is just confusing - too much information is <EM>disinformation</EM> -&nbsp; it just adds more work instead of simplifying it because you have more things to check and they keep moving.</P><P>MacBook Pro, 13 inch 2022, OS Sequoia 15.7.9</P> Fri, 21 Aug 2026 23:22:48 GMT Justaminute 2026-08-21T23:22:48Z Firefox 153 doesn't let me change the font size - I reverted to 152!!! https://connect.mozilla.org/t5/firefox-labs/firefox-153-doesn-t-let-me-change-the-font-size-i-reverted-to/m-p/135370#M5209 <P>Firefox 153 ignores userChrome.css even with&nbsp;toolkit.legacyUserProfileCustomizations.stylesheets<BR />set to "true".</P><P>After spending two days trying to increase the unreadable font size in tabs and the bookmarks sidebar, I reverted to Firefox 152.</P><P>Created chrome folder, userChrome.css - and now, I can read again!</P><P>What difference can it make to YOU, what size of font do we use??</P><P>The very reason why I have chosen Firefox in the first place is because it is supposed to be 'configurable'!</P><P>By the way - I didn't like the AI stuff either! It is just confusing - too much information is <EM>disinformation</EM> -&nbsp; it just adds more work instead of simplifying it because you have more things to check and they keep moving.</P><P>MacBook Pro, 13 inch 2022, OS Sequoia 15.7.9</P> Fri, 21 Aug 2026 23:22:48 GMT https://connect.mozilla.org/t5/firefox-labs/firefox-153-doesn-t-let-me-change-the-font-size-i-reverted-to/m-p/135370#M5209 Justaminute 2026-08-21T23:22:48Z