When I went to install Pentadactyl from the Firefox addons site, it told me that Pentadactyl wasn't compatible with my (the latest) version of Firefox, 27.0.
The developer(s) are slow about incrementing the allowed versions. Literally all you have to do to make it work (usually) is vim ~/.mozilla/firefox/yourprofile/extensions/whatever.xpi, then type /install.rdf, hit enter twice, edit <em:maxVersion>n</em:maxVersion> to be +1, then hit :x and you're done.
Of course this requires that you have it installed beforehand, otherwise just download the files manually and edit install.rdf before installing it.
> The developer(s) are slow about incrementing the allowed versions.
> Literally all you have to do to make it work (usually) is vim ~/.mozilla/firefox/yourprofile/extensions/whatever.xpi, then type /install.rdf, hit enter twice, edit <em:maxVersion>n</em:maxVersion> to be +1, then hit :x and you're done.
Can you (or anyone else) explain why the developers hesitate to fix this problem officially? Like you said, it is rather simple to fix.
Even though most of us on HN are able to apply the fix ourselves, integrating the fix to the official pentadactyl extension would save time for everyone that wants to try or install pentadactyl.
Sorry I don't know why this happens, but as far as I can tell they do increment the nightlies (usually a couple weeks after a new Firefox version). I don't know why the version on the plugins site is so out of date though, you'd have to ask one of the developers (irc.oftc.net #pentadactyl).
Every time I upgrade Firefox I get a notice that Pentadactyl isn't compatible, at which point it asks if I'd like to check for a newer version. Then it searches and installs the latest snapshot and that's it. I've found nothing wrong with the nightly version.