Firefox vs Firefox?

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http://forums.fedoraforum.org – My question basically pertains to running firefox from the repo vs running it from /opt. What I usually do is download firefox from mozilla ftp, extract, move to /opt, set symlink to plugins, and then edit /usr/shar/applications/firefox.destop, then save with new name. Once everything is working properly I delete fedoras firefox and go from there. The big question is how is this as far as security goes. I know that my firefox install will update accordingly, but is it as safe as fireox in repos? Henry (HowTos)