Firefox Extensions for Bookmark Icons
Firefox extensions are available that help you remove and change your Firefox bookmark icons.
Delete Bookmark Icons is an extension that will go through your bookmarks and remove the icons that Firefox has associated with them. This will conveniently allow Firefox to restore them while your browser is in use. Be sure to select the version of this extension that matches your version of Firefox.
With this extension installed, you will see a "Delete Site Icon" option when you right click on a bookmark.
Click on it and the bookmark icon will go away.
To restore your icon, click on your bookmark and Firefox will restore the correct Bookmark icon for you.
The final extension, Favicon Picker will let you manually assign virtually any image to your bookmark to be used as a Firefox bookmark icon.
This extension adds a "Properties" option to the context menu when you right-click on a bookmark. When you click this option, you get a "Properties" window that allows you to edit your bookmark. To change your Firefox bookmark icon, click the "Browse" button.
Use the Windows interface to browse to the image you wish to use as a bookmark icon and then click "Open." Your selection will now be visible in the "Properties" window for your bookmark.
Now, click "Save" and then click the "Bookmarks" option from the main menu to confirm the change.
You now have learned about Firefox bookmark icons, how to delete them,how to restore them, and how to replace them with your own custom images.
Image Credits: Screen shots taken by Bruce Tyson