Clearing recent history on Firefox freezes browser.

Question

This is actually a problem and what I did to fix it....
Firefox 25 and Mac OS 10.7 (Lion)
Went to "Clear Recent History" and Firefox stopped responding.
• I had to use COMMAND-OPTION-ESC to quit Firefox
I then went to Firefox preferences-->Privacy-->History
• I changed "Remember History" to "Use custom setting for history"
• I checked the box that said, "Clear history when Firefox closes"
THIS IS WHEN THE PROBLEM HAPPENED
• Clicking Firefox from my Startup Menu would cause the pointer to spin endlessly
• Again, I had to use COMMAND-OPTION-ESC to quit Firefox
At this point I was worried that I could lose all of my Bookmarks with a clean install,
so I went to the internet and found out I could start Firefox in a "Safe Mode"
Here is what I did to correct the problem....
1) Hold down option and click Firefox from the Startup Menu (Firefox starts in Safe Mode)
2) I then went to Firefox preferences-->Privacy-->History
3) I unchecked the box that said, "Clear history when Firefox closes"
4) I changed "Use custom setting for history" to "Remember History"
5) I closed the Firefox preferences and Quit Firefox
When I restarted the computer all of my Bookmarks had returned :-)

Answer 1

That was very good work. Well Done.
These can't get your data back, but will help in the future.
These add-ons can be a great help by backing up and restoring Firefox
'''[https://addons.mozilla.org/en-US/firefox/addon/febe/ FEBE (Firefox Environment Backup Extension)]''' {web link}
FEBE allows you to quickly and easily backup your
Firefox extensions, history, passwords, and more.
In fact, it goes beyond just backing up -- It will actually rebuild
your saved files individually into installable .xpi files.
It will also make backup of files that you choose.
'''[https://addons.mozilla.org/en-US/firefox/addon/opie/ OPIE]''' {web link}
Import/Export extension preferences