Important: Down Them All 1.0 changes certain "network.http" preferences that will need to be reset, even if you disable or uninstall the extension.
Conflicts with the IE Tab extension (broken/blank Location Bar) and the Tab Mix Plus extension (oversized tab bar) , adds "spam" links to the Bookmarks menu, adds the User Logos search plugin and makes it the default search engine, searches may redirect. Update to version 2.18 or above (available from the Fast Dial Homepage).
If uninstalled, use about:config to reset the preference network.protocol-handler.external.mailto to true (double-click will toggle).
After bookmarking a page with Bookmark Star can't Edit the bookmark from the Bookmark star nor with Ctrl+D to modify or remove the bookmark in at least Firefox 3.6.12 and 3.6.13.
Note: The FDM extension (v 1.0 - 1.3.1) is on the Add-ons Blocklist; v 1.3.2 is not blocklisted but it also crashes Firefox.
If still installed, UNcheck "Send with GMail" in Google Toolbar Options.
If necessary, delete unwanted bookmarks, reset toolbar customizations and change to your preferred search engine in the Firefox Search Bar.
May also need to reset preferences related to (such as keyword. Firefox may remain in the processes list at exit, causing a "Firefox is already running but is not responding" error (or problems with bookmarks, history, and toolbar buttons due to a locked Places database) when restarting Firefox. Note: A conflict with the anti-phishing component of Norton 360 2.0 or Norton Internet Security 2008.5, if installed, can cause the hang at exit and locked Places database.
In Firefox beta 4.0b9pre though it doesn't interfere with bookmark star it hangs Google Search and so does not do its function of reporting on sites in search results listing.
The "Block all embedded objects" preference is set to "Yes" by default, causing embedded media normally handled by plugins to disappear, including Flash content. May cause redirected searches, failed keyword searches and/or the "File not found" error, Firefox can't find the file at jar:file:///C:/Program Files/Mozilla Firefox/chrome/en-US.jar!
/locale/browser-region/region.properties May cause "New Tab" button and "Ctrl+T" to fail. May need to uninstall via Windows Control Panel (see Uninstalling toolbars).
As a workaround, disable Phishing Protection in Norton's settings or remove the Norton toolbar from Firefox as detailed here.May cause web browsing to slow to a halt to the point that nothing loads.