I noticed a while ago that my Echofon toolbar button had dispapeared in Firefox. I couln’t find any information how to fix this, except that i should enable the add-on toolbar. But Echofon had Firefox toolbar support, so I souldn’t need the add-on bar.

I’ve found out how te re-enable the toolbar button, and decided to share it here.

1. Navigate in Firefox to about:config
2. Accept the warning notification:
   
3. Type or paste the following string in the filterfield: extensions.twitternotifier.toolbarButtonAdded
4. Doubleclick on the item which shows up, and make sure it is set to “false”.
   
5. Restart Firefox

Now the toolbar button should have reappeared.

Please leave a comment if this solution has worked for you!