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Some users have encountered a strange problem in Mozilla Firefox, where they see a fake favicon for each website they have bookmarked. For example, instead of displaying the Reddit icon for Reddit bookmark threads, the browser displays a YouTube favicon (or something else). The problem does not seem to be related to a particular version of Windows because it occurred on Windows 7, Windows 8 and Windows 10.
How to fix wrong icons that may appear in the Firefox browser for one reason or another.
Cleaning Firefox’s cache and cookies
Clean your cache and cookies for your website, reload them and take a look.
Search for a Favicon converter
Reset all preferences
You may consider deleting favicons.sqlite in the profile folder to reset/delete all favicons. To do this, you must use (visit) any bookmark you wish to display with its favicon.
You can use the button on the “Help -> Troubleshooting Information” page (via:Support) to access the current Firefox profile folder, or use the page via:profiles.
- Help -> Troubleshooting information -> Profile directory: Windows: Show folder; Linux: Open folder; Mac: Show in Finder
http://kb.mozillazine.org/Profile_folder_-_Firefox
Add a’/’ behind the link
This may seem like a stupid solution, but many concerned users have reported that simply adding one at the end of the URL before visiting it has solved the problem for them. Hoverer, some users reported that this patch was only temporary because the problem was fixed a few days later.
Let’s say that the favicon of www.google.com/ is confused. To fix this, type www.google.com// in the navigation bar and press Enter to update the icon. The icon must be replaced once the website is loaded.
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Check the Bookmarks.html folder.
You must find the folder bookmarks.html for your Firefox.
Under Windows XP, it is for me an exciting journey through the following folders: Documents and settings – User name – Application data – Mozilla – Firefox – Profiles – a Gobbledygook folder.
Make sure your browser does not work and open the bookmarks.html folder in your favorite text editor.
Force Refresh Favicons
To update your site’s favicon, you can force browsers to download a new version by using the link tag and a query string on your file name. This is particularly useful in production environments to ensure that your users receive the update.
CONCLUSION
When you add bookmarks to websites using the Firefox browser, the bookmark is displayed with the favicon in the toolbar or menu. If you do not see the bookmarks and favorites you see, the toolbar can simply be disabled. If the toolbar is enabled and some content is missing, the problem may be the folder in which you saved the bookmarks or the layout of the toolbar.
https://support.mozilla.org/en-US/questions/1226447
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