So I just switched back from Chrome to FF. I tried to install Kee from mozilla.org and I got “This add-on requires a newer version of Firefox (at least version 56.0). You are using Firefox 52.0.” But I’m actually running 59.0.2 (64-bit) . On my Linux machine it just installed normally as one would expect.
I tried installing from the .xpi directly but FF won’t let me, even with the “xpinstall.signatures.required” switched to off.
Any ideas? Thanks.
How strange.
Do you know if you have any other add-ons installed or perhaps a customised user agent string?
This doesn’t really appear to be a problem related to Kee since it is the addons.mozilla.org (AMO) website which is incorrectly detecting the version of your browser.
If changing or removing other addons doesn’t help, I suggest raising an issue on Mozilla’s GitHub account so they can help diagnose and fix the problem: https://github.com/mozilla/addons/issues/new