Future of X-notifier for Firefox
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Firefox is preparing huge changes in its internal structure.
https://blog.mozilla.org/addons/2015/08/21/the-future-of-developing-fire...
Becuase of these changes, X-notifier for Firefox cannot keep current features.
Current version is based on XUL/XPCOM. It will be deprecated near future.
It is recommended to use WebExtension API.
It is nearly same as Chrome Extension API.
In short, next version of X-notifier for Firefox(X-notifier 4.0) will be based on WebExtension API.
It will be nearly same as X-notifier for Chrome.
Current setting are not shared with X-notifier 4.0.
Please use export/import function before you update to 4.0.
--- Added in 2016-09-08 -------------------------------
X-notifier 4.0 could not pass review process of AMO.
This is because of 'eval' function which is used to load userscript.
It means that you cannot use userscript in X-notifier 4.0 for Firefox.
I recommend to use X-notifer Neo.
https://addons.mozilla.org/en-US/firefox/addon/xnotifier-neo/
--- Added in 2016-12-01 -------------------------------
If you want to stick to 3.5.23,
1. In Firefox's Add-ons Manager -> X-notifier -> More -> Set 'Automatic Update' to 'Off'
2. Install 3.5.23 from here https://addons.mozilla.org/en-US/firefox/addon/xnotifier/versions/
This version will stop working in the future according to Firefox team's plan.