I'm guessing that you need to update the install.rdf right? Yes, you can do that with ark.
Open the .xpi file in ark.
Drag&Drop the desired file out of it (or use the "extract" action).
Use a text editor to modify the file.
Drag it back into the archive (or use the "add file" action).
The old version will be automatically replaced with the new.
That's it!
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