Won't work on the new firefox or won't install?
If it is saying it isn't compatible it can just be because of the version check thing rather than it never going to work.
Download the .xpi file that is the addon rather than installing it.
rename .xpi to .zip and unzip it. There is a file called install.rdf and inside that you need to change where it says <em:maxVersion>number</em:maxVersion> to <em:maxVersion>18.0.*</em:maxVersion> or whatever version you are trying to install it on.
zip everything up again. rename to .xpi and try installing it.
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