Rainbow wheel appears when I open Firefox - then it hangs and all I can do is force-quit.

I have uninstalled and reinstalled Firefox on my Macbook Pro. The same thing keeps happening - I open Firefox and the rainbow wheel appears - that's it. I have tried to reset Firefox (I was able to click a "reset" button yesterday but nothing happened. I tried to reset it today but an unable to do so). All I can do is force quit the application. I think resetting it to default might work but I cannot write anything in the address bar or click on any of the tabs because the rainbow wheel is the only thing that appears. This has never happened before and I don't know what's going on.
Thank you in advance for your help.

Press the '''Alt''' or '''F10''' key to bring up the tool bar. Then select
'''Bookmarks'''. Hot key is '''<Control>''(Mac:<Command>)''<Shift> B.'''
Once the window is open, at the top of the page, press the button labeled
'''Import and Backup.''' Select '''Export Bookmarks To HTML,''' and follow
the prompts and save it to a '''HTML''' file. Copy the file to another computer.
Repeat the instructions above, BUT select '''Import Bookmarks From HTML,'''
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

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Rainbow wheel appears when I open Firefox - then it hangs and all I can do is force-quit.

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