Wow! How many times, no, years have I been frustrated over the lack of "open these links"-function in web browsers.
Thank you so much for making this add-on! =)
PS. This tool paired with a session tool for tabs makes for a powerful combination.
Once again, thank you so much!

2019-11-18
Edit: The addon didn't work at first. Seems CTRL is used by something else on my PC. With ALT + LEFT MOUSE it works like a charm! =)
Edit 2: Or just right click without modifier.

v3.1.7 will not work on FF 52.9.0 ESR (last non multi process version). No mouse button will activate the selecting rectangle and any changes to options revert to default settings.

v3.1.6 will give me a rectangle, but it won't scroll down the page when I drag the mouse below the screen.

v3.1.5 will, like 3.1.6, let me select links, and will scroll when I drag the mouse below the screen, but it won't scroll when I use the down arrow or the mouse wheel.

This has been my favorite extension for a long time. While I'm sure that it most likely plays nicely with multi-process FF, is there any way you could get a working version for those of us who can't upgrade? v3.1.5 with the ability to scroll down the page with the down arrow would be immensely invaluable. Thanks.