Following my previous post on IDEA keyboard shortcuts, I was inspired to look for the same thing for Firefox. In particular I use the Copy URL function a fair bit but saddened to learn it doesn’t have a shortcut provided out of the box.
There is the keyconfig addon that provides the ability to look and add keyboard shortcuts to functions. Strangely you cant change a shortcut, only add new ones by default. However, there are addons for this addon 
that allow you to set shortcuts to actions that normally don’t have such functions.
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Byron Bay
