After using Chrome for a decade and switching back to Firefox, one feature I missed was the ability to right-click and Go to [url] directly, for any selected text that vaguely resembles a URL.
I made Goto foo to approximately replicate Chrome's behavior in Firefox, but it would be nice if no extension were necessary.
Highlight it and drag it up to the tabs bar. It'll open in a new tab. Or drag it onto an existing tab and it'll open in that tab. Highlight any arbitrary text, do the same, and it'll search that text in your default search engine.