Fix Firefox 4 history, bookmarks, back & forward button

[zero-n]

I have install Firefox from it official PPA but i had these problems:
- History is not working.
- Bookmarks disappeared.
- Back & Froward buttons won't works.

after some googling i found a solution for it in Mozillazine.org Knowledge Base.

Steps to fix the problem:
1- Open Firefox profile folder:
Help >> Troubleshooting Information.
& then in Application Basics click on Open Containing Folder
this will open a window of profile folder location.
2- Close Firefox.
3- Delete every file beginning with places.sqlite
4- Restart your Firefox & it will automatically restore your bookmarks

[jcanini]

This just happened to me today. The above soloution worked perfectly.