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I stumbled over this little trick a long time ago, but I’ve just decided to share it. This allows you to open Firefox inside of Firefox. I thought it was pretty cool originally. Now, I find it just weird. It’s just a side effect of Firefox’s GUI being written in XML. It’s not really useful, per-say, but it’s sort of fun to mess around with. To do this trick all you have to do is open a new tab, paste this in: chrome://browser/content/browser.xul, then press the Go button. There you go, Firefox inside of Firefox. A completely weird and pointless thing you can do.
I could open 4 before my computer started to lag. How many could you open before yours starts to lag?