Does not work in firefox. No context menu item appears.

Context menu entry doesn't appear, so no effect.

Requires clipboard permission: "Input data to the clipboard". Why?

Scam. No such option 'open frame' at all

Really simple - it didn't work. Adding the extension did not show the option in the context menu as per the screenshot (FF 58.02 / Windows). It's rare to have an extension work these days.

Don't work :'(