I’m used to a certain way of controlling all my tabs.* I need firefox‘s settings ‘browser.link.open_newwindow’ and ‘browser.link.open_newwindow.restriction’, to work the way I want to work. But because some websites make links open in new tabs (technically in new windows I suppose), not via the target attribute, but via something else, I really want to set browser.link.open_newwindow.restriction to 0. Just to normally browse the internet.** But some other websites who use scripts in a bona fide way for things like logging on, don‘t take users like me into account, who have set browser.link.open_newwindow to 1 and browser.link.open_newwindow.restriction to 0. For example, logging on to Feedly fails, because it can only be done in a pop-up. Expanding one message in Gmail also isn‘t possible with my settings. For such instances I would like to be able to toggle browser.link.open_newwindow.restriction from 0 to 2. Or from 0 to 1, that would be just as good. It just needs to be 0 as a default, but toggled to something else when needed. I wouldn‘t know the first thing about making such a button. I guess what I‘m asking is: how easy is it to make one (if it doesn’t exist already) and are there instructions somewhere, that are comprehensable for a layperson? ———  * If I left-click on something it means I want to leave the current webpage and go to the clicked webpage in a the same tab. The things I want to open in a new tab to read soon, I open in a new tab, and it opens in the background as the rightmost tab. A part of my brain makes sure the amount of tabs doesn‘t grow too large. Something interrupting I need to read right now I open in a new window. I’ve always worked like this. Even the last years, when more and more websites and browsers started to push a model where tabs are opening left and right, the back button suddenly closes a tab and moves the focus somewhere unexpected etc.  ** a good example of a website which would still open left-clicked links in a new tab even with browser.link.open_newwindow set to 1 is quora.com, but that‘s just one I think of and there are many, many more.