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

Qqen
Tignit n uzegrir

Iceggiren i Multithreaded Download Manager

Multithreaded Download Manager sɣur jingyu9575

4,4 n yitran ɣef 5
5
248
4
54
3
21
2
8
1
20
Tiririt sɣur jingyu9575

Tiririt n ineflayen

yeffeɣ-d deg pred 5 rokmi
I think it is because of the API changes. See https://github.com/jingyu9575/multithreaded-download-manager/wiki/Important-changes-for-Firefox-75

Try updating the extension to 3.2 and set "storage API" to "default". Unfortunately, old downloads that starts with the old API cannot be continued with the new API.