Popup To Tab v0.2.2
Hate it when websites open their portals in a popup window because they're so special and need to hide the back and forward buttons? Chrome has the ability to convert popup windows into regular windows by right-clicking on the popup's system icon and choosing "Show as Tab", so why can't Firefox?
With this add-on you can now turn a popup window into a tab window and merge it into your main tab window. That way everything fits neatly into your tabs and you don't have windows flying everywhere.
The next time you have a popup open, simply right-click on any tab in another window and choose "Move Popups Here" and any popup windows will be merged into that active window as a tab.
Permission Disclosure:
I am pleased to report that this extension requests no discernible permissions, so you may use it in complete confidence.