We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

userChrome.css file not being recognised/implemented by Firefox

David d'Arcy
David d'Arcy
more options

Recently updated Firefox to FX65 and as expected had the 'Tabs on top problem return.' Followed advice given earlier in <Tabs not on Bottom> forum post and found that there was no 'chrome' folder in my Profile folder so created one and then added the 'userChrome.css' corrected file to move my Tabs back to the bottom. However, on restarting Firefox this fix did not work on my laptop. N.B.: it worked fine for my desktop PC.

So i now need help please?

Recently updated Firefox to FX65 and as expected had the 'Tabs on top problem return.' Followed advice given earlier in <Tabs not on Bottom> forum post and found that there was no 'chrome' folder in my Profile folder so created one and then added the 'userChrome.css' corrected file to move my Tabs back to the bottom. However, on restarting Firefox this fix did not work on my laptop. N.B.: it worked fine for my desktop PC. So i now need help please?

Chosen solution

If you used the same userChrome.css file and created the chrome folder in the correct location then this should work. You can check that the userChrome.css file doesn't have a hidden .css or .txt file extension (userChrome.css.css or userChrome.css.txt) and that it is a plain text file (e.g. open the file in a Firefox tab).

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:preferences page.

Read this answer in context 👍 1

All Replies (2)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Chosen Solution

If you used the same userChrome.css file and created the chrome folder in the correct location then this should work. You can check that the userChrome.css file doesn't have a hidden .css or .txt file extension (userChrome.css.css or userChrome.css.txt) and that it is a plain text file (e.g. open the file in a Firefox tab).

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:preferences page.

David d'Arcy
David d'Arcy Question owner
more options

Well i don't quite understand why, but after deleting all my work and re-applying the 'chrome' folder and corrected 'userChrome.css' file it all worked fine this time. I suspect, as you suggested, there was some file permissions trickery going on.

Thank you for your help.