Have you had a chance to review this article? Firefox crashes | Troubleshooting | Firefox Help

If you can find a pattern to when Firefox crashes (e.g., videos, complex pages, etc.), that may be helpful in tracking down the problem.

I already tried those steps but couldn't find any solutions. The signature is js_CheckForStringIndex(int). Hope you can help. Thank you.

There are some people who post here who can look up crash IDs and provide very specific help, but unfortunately I have no access to that data.

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You might want to try a new profile. It's a hassle migrating your settings, but it's a hassle crashing, too.

First, I recommend backing up your Firefox settings in case something goes wrong. See Backing up your information. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)

Next, close Firefox and fire up the Profile Manager and create a new profile. Managing profiles.

To move key settings like bookmarks from your damaged profile to the new profile, see: Recovering important data from an old profile.

Hope this helps.