I have reset Firefox, but still cannot open Preferences.

I am running OS 10.6.8 on MacBook Pro and have been using Firefox for years as my primary browser. The crashes have been increasing over the last few months until now, Firefox crashes multiple times a day. I cannot get the Preferences to open from the File menu. I have uninstalled and reinstalled Firefox. I am at a loss to figure out what to do next. All my other applications run fine. Firefox is running on other Macs in our house under newer operating systems, but this has become a severe problem.

Create a new profile as a test to check if your current profile is causing the problems instead of using a reset.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
Try a clean reinstall in case there has been problems with updating.
Download a new copy of the Firefox program and save the disk image (dmg) file to the desktop
*Firefox 21.0: http://www.mozilla.org/en-US/firefox/all.html
*Trash the current Firefox application (e.g. open the Applications folder in the Finder and drag the Firefox application to the Trash) to do a clean (re-)install
*Install the new version that you have downloaded
*https://support.mozilla.org/kb/Installing+Firefox+on+Mac

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