I am back here after some delay. I have completely forget some things. First of all how to login the forum? I coulnd find any login link. I found just the + icon … but what confused me why you are sending link to login on a email… This is unusual/non-standard.
Second thing. I forgot how to open the tab for debugging webextensions. I know there was some address to be typed in the new tab to open the Firefox page where I can open unsigned plugin (the version developed by me). I hardly miss this as an option in the Tools menu.