Presumably because these addons (which you haven't named, so I can look at them) do not run in the webpage at all - hence they can run on non-web pages and pages where addon content scripts are blocked, like the mozilla addons site). This addon requires code to run in the page to capture the users interaction with it (mouse buttons and wheel). If you don't believe me please see the the Mozilla documentation: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_scripts

The options page (and similar) aren't web pages, so addons simply do not get run on them. Also, Firefox specifically blocks addons from running on pages of the Mozilla addon website (to prevent malicious addons being able to hijack others).

Hi. I have now implemented OSX support via a slightly different mechanism, please try v1.0.6.

Actually it works perfectly on FF60 on Linux (and Windows) as I'm using it here on both right now.

Please read the limitations section on the addon information page, as you're probably testing it one of those scenarios (for example it will not work on this page, because no addons can run on addons.mozilla.org).

If you continue to have problems please raise an issue on GitHub and I'll look into it for you.

I can look at allowing a choice of mouse button, for example the middle one, but would that be any more convenient? Feel free to open an issue on githhub and we can discuss your requirements and see what's possible.

Yes it does, it's been tested extensively on v58 because support for Linux was added at this version. Perhaps you can supply more information (open an issue on GitHub where there can be a proper discussion) on your problem and I will try to help you with it. Please also be sure to read the addon information, especially the limitations section for details of where the addon cannot operate.

Edit: Thanks for the update, glad it's working for you now.

If you have having difficulty why not raise an issue on GitHub (https://github.com/raburton/tabscroller/issues) and I can try to help you with it. Perhaps you are using an untested platform for which I can add support, but you have not provided any information at all in your review to help identify your problem.

Update: Why not raise an issue on GitHub and we can have a discussion, this isn't really the best place. A good starting point when opening an issue would be to include what version of Firefox you are using and what platform you are on.