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

Qqen
Tignit n uzegrir

Iceggiren i Select After Closing Current

Select After Closing Current sɣur jingyu9575

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Icegger-it dfk
sɣur dfk, 7 éve
it is good, but i don't know what order to make it work like it used to with Tab Mix Plus on FF 55.

Also the settings text is black and unreadable if using high-contrast mode on Windows.

Tiririt n ineflayen

yeffeɣ-d deg 7 éve
The default setting of Tab Mix Plus seems to be "Opener/right tab" on Waterfox 56. For this behavior, set the 1st line to "First - Parent tab", 2nd line to "Right - tab", 3rd line to "Last - tab".