Have used Firefox for a long time and now it will not boot up and I get message saying cannot initialize security component. Have uninstalled and re-installed Yahoo optimized 5 version and still the same.

The only thing I have done different in the past few days is to install trial version of Bitdefender Total Security and I used the PC tune-up feature for PC clean-up and registry cleaner. That seems to be the point I could not loner use Firefox.

I have Firefox 3.6.6, and now that Firefox 4.0 is available, it crashes constantly. Sometimes less than 5 minutes after I open it. I have a Mac 10.4.11, so Firefox 4.0 isn't an option for me. When I asked Ff to check my plug-ins it said there was an error and to check back later. Twice.
Because I didn't have any (any) problems with my Ff before the upgrade became available, I am forced to question if Ff has done something to make the earlier version crash so you'll upgrade, but I can't afford to upgrade my Mac right now.
In the meantime, I do need a browser that works! I dislike Safari, Chrome is also not available on Mac 10.4.11, and Explorer is just plain not available on Mac.
Do you have any suggestions on how to fix my Firefox 3.6.6?
Ty

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