I know I run into this issue from time to time and have yet to find a good solution.
It is hard to select the text of a link and not click on the link by accident. The Copy Link Name extension gets rid of that issue and gives you right-click access to copy the text you need. It copies the name (source anchor) of a link. Just a small extension that adds a context menu item to copy a link’s source anchor. Sure it could do more - but it does not have to.
+ Download and Install the Copy Link Name Extension for Firefox!
