Thinking that this method is simpliest, I tried wirh rjvmimeedit, and it works too.
Nice ...
George, just a detail about modification in xpi or jar:
Under Linux, with file-roller, and Windows with 7Zfm (7-Zip file-manager), you don't need to extract.
Just open the archive, open the file, edit, and save.
Then the zip manager knows a change has come, and purpose to update the archive.
Forum:
Extensions