To use these add-ons, you'll need to download Firefox.

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Iceggiren i Context Search Origin

Context Search Origin sɣur NNKOD

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yeffeɣ-d deg hace 8 años
The API for that is available in Firefox 60 (bug 1215376) and I intend to release a new version as soon as possible!

Edit: it is released and ready for download.