The way I have installed extensions manually is to open the Firefox
browser, goto > Tools > Extensions then drag and drop the extension
into the box called "extensions" it should prompt you once you drag the
extension into the box.
This may or may not work. I think it depends on which extensions are
installed -- some of them may use absolute paths, which makes moving
them around impossible.
Create a new profile with your new Firefox, then close Firefox and
overwrite everything in the profile folder with the files from your
backed-up profile.
If none of that works for you, I think you could create a new profile,
install fresh copies of the extensions you want, then overwrite
prefs.js with your backed-up prefs.js. Most extensions store their
options there, so you wouldn't have to reconfigure everything.
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