Firefox and Abrowser
The only difference between Abrowser and Firefox is the addons repository? If so, if I install Firefox and only free addons am I using a GNU-compatible software?
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Yes, Firefox, the software is free software with a free software license. The logo is not libre. A logo is not software though, but art, or symbol. So.. if you are ok with that, with the nonfree painted fox, go for it, yes.
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There are other differences between the browsers other than artwork licensing, such as Abrowser removing support for HTML5 DRM and also removing telemetry/data collection/tracking (and linking to a free add-on repository).
And is it possible to disable telemetry/data collection/tracking in Firefox (and also HTML DRM)? And if I disable them is Firefox like Abrowser (apart the logo)?
There are more differences: https://devel.trisquel.info/trisquel/package-helpers/blob/e635557062a4ae58271908143b644d10ed2a8b12/helpers/make-firefox
For instance, uBlock Origin is installed by default, DuckDuckGo is the default search engine, settings.js in https://devel.trisquel.info/trisquel/package-helpers/tree/e635557062a4ae58271908143b644d10ed2a8b12/helpers/DATA/firefox tweaks many settings, etc.