Howto realy realy reset firefox without commandlin

A friend sent me, this:

Firefox immediately fails on startup.
I don't have any idea what was going on, but the solution was to delete ~/.mozilla . Of course i was not near to the machine, so I had to give instructions how to fix this over the remote.
Next Problem: My friend got only basic skills.
Solution: Made a screencast how to fix it and sent it over.

If you also don't know what "delete ~/.mozilla" meens you can follow that instruction:

Howto create screencast: https://wiki.ubuntu.com/ScreenCasts/ffmpeg

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