One common task I use SearchFox for is auditing all of the uses of a particular local variable. This is difficult when the method is multiple pages long, which is unfortunately fairly common in Gecko. My current approach is to hover over a use or definition of the variable, then scroll the page. This retains the highlight as long as I don't jostle the cursor, but is awkward. I think it would be nicer if I could click on a use or definition of the variable and get a little menu that I could click on to a search for all instances of that particular variable, like we get for a method.
[Tracking Requested - why for this release]: