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

Qqen
Tignit n uzegrir

Iceggiren i Duplicate Tab

Duplicate Tab sɣur Skeletonxf

4,2 n yitran ɣef 5
5
16
4
7
3
2
2
0
1
3
Tiririt sɣur Skeletonxf

Tiririt n ineflayen

yeffeɣ-d deg 8 jierren lyn
What operating system are you using and which shortcuts have you tried?
Edit: Windows default is now ALT+SHIFT+D