This should be redunkulously easy, but I've been sifting through addons and googling for an hour, and am pulling my hair out. I have 5 websites. I want to be able, with one click, to open them all in tabs. In Safari, I would put them all in a folder, then check the "Auto-Click" checkbox. But in FF, I'm stumped. Obviously I can choose "Open All in Tabs," but that's extra work and clutter. I'll never be visiting these URL's independent of each other. I simply want to click one item in my bookmarks toolbar (or anywhere else, as long as it's just one click) and have all 5 URLs open. There's gotta be a way to do this...?