I've become increasingly disappointed with the instability issues of the more recent Firefox versions. What used to be an unshakable rock-solid browser platform now crashes more than the worst versions of iE ever did! Between the "Unresponsive Script" errors (which seem to be .jsm related), and the "plugin-container.exe" errors, my browser crashes several times a day.

There doesn't seem to be much effort to fix this problem. And, I'd like to rollback to a previous more-stable version until the issue is resolved. Where can I find an older version of Firefox? And, what was the version number of the last stable version, the one before these types of crashes began?