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I keep getting prompted to update my copy of FF. Can i? or will this effect the functionality of PFF?
"If you're not part of the solution, you're part of the precipitate."
you can and should update your PFF to V22.214.171.124.
It will not (really) effect the functionality of your PFF. The only possible little drawback could be - if you used the former (UPX-/JAR-)compressed version of PFF - that PFF will download the full (uncompressed) upgrade (~8MB?) and because of the uncompressed files will take a few more seconds to start when connected via USB1.
Portable Firefox 1.5 is not UPX'd. The "small" upgrade *should* work from PFF 1.5 to 126.96.36.199, but for some odd reason, it doesn't. It still downloads the full package.