Firefox Addons
Do not use use those plugins with Tor Browser installed standalone or from Tails.
Protect against browser fingerprinting
Try this browser check with Firefox, then install this and try again.
https://addons.mozilla.org/en-US/firefox/addon/no-resource-uri-leak/?src=collection&collection_id=0a1193fd-9e51-4a46-9987-add66f8c5ee7
An alternative:
https://addons.mozilla.org/en-US/firefox/addon/canvas-fingerprint-blocker/?src=collection&collection_id=0a1193fd-9e51-4a46-9987-add66f8c5ee7
Ad-Busters
AdNauseam is a powerful response to advertisers: not only it blocks ads, it also clicks ads for you to neutralize your profiling and confuse ads algorithms. Moreover it provides extra privacy settings, e.g., to disable IP leak with WebRTC.
uBlock origin as replacement for Adblock Plus, Adblock Edge etc. since it is faster can use the same blocking lists etc.