How to reinstall firefox on macosx with deleting all profile data. Troubles * {display none} ?

Hello guys :)

I'm on latest macosx and latest firefox. I tried the application called Stylish to add custom css. I was in a haste to check work it or not and wrote:

star_selector { display: none } for all sites.

And that killed my firefox. I can see only white screen:

No bars and nothing opens from menu. Can't wrote about:config or open tools->addons or Help->troublehoot.

I tried to reinstall app several times. But it is not a solution.

I checked this article: but I have not firefox directory in library / application support. Probably I delete it early. I still can see old bookmarks and addons in menu. They don't dissapeare.

Yes, this is one of the biggest mistakes I've ever made :). Ideas left me. I will be very grateful for the help.

P.S. There is nothing I need to save from data. I can reinstall it with no wories about bookmarks or something.

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