On Thursday January 22 2009, Dave Plater wrote:
Thanks all, I couldn't find the lockfile but deleting the entire
contents of the ~/.mozilla/firefox directory and logging out and in
again sorted it out. Now all I have to do is retrieve my bookmarks
In the future, just move the directory away from the place that makes it
special, don't actually eradicate it!
I think firefox was running when I backed up the home directory. I'm
going to try restoring it with firefox running and see what happens.