As of T7289, I want to make a new Desktop Action which allows to open a new tab on Mozilla Firefox. It can easily be done using firefox --new-tab.
There is already a pending request on their bug tracker .
However, this issue is rather old and has not been fixed. As such, I think it will be faster to integrate it to Solus directly.
So if Solus devs approve my request, then I would be very happy to provide you the necessary patch.
Can confirm it works as expected. @kyrios123 Let's get this added to the Desktop Actions in files/firefox.desktop for your 64.0 patch.
Update Actions to Actions=new-window;new-private-window;new-tab;
Add the following after the new-private-window desktop action (with a new line between them):
[Desktop Action new-tab] Name=Open a New Tab Exec=firefox --new-tab about:newtab