This question comes up quite a lot on message boards, Reddit, etc. and the answer is simple – if you use Firefox Sync like a lot of us do, Firefox grabs the favicon for your bookmarks in the background to a service or server hosted in Amazon’s massive AWS ecosystem. That’s it!
Category: Firefox
Completely Remove Firefox Tab Bar
If you’re a user of Tree Style Tabs or enjoy vertical tabs, use this tweak to remove the tab bar at the top of your screen where tabs used to live.
You can edit the userchrome.css file by using the following steps:
- Go to about:support in Firefox
- Scroll to the Profile Folder line and click “Open Folder”

- Make a new folder called “chrome”

- Inside this new chrome folder, make a file called userchrome.css
Once in the file, add your tweaks! To remove the tab bar, use this snippet of code:
#TabsToolbar {
visibility: collapse !important;
}
For other ideas and customizations with userchrome.css, take a look at the FirefoxCSS Subreddit