Oh non, quelle tristesse. WOT c'est vraiment une super extension, je suis vraiment dégouté de lire ça. Et donc de la dégager… Snifff.
(Note: I'm the original author of this extension, but haven't been affiliated with it for the past few years, during which time I believe there's been an ownership change.)
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However, the actual issue that's being widely discussed in German media, which both you and AMO reviewers at the time appear to have completely missed was introduced in 2015 in this commit:
https://github.com/mywot/firefox-xul/commit/0df107cae8ac18901bd665acace4b369c244a3f9This change adds logging of each visited URL and clearly attempts to obfuscate the traffic with double Base-64 encoding. Definitely sounds like something that should have been indicated to users.