I knew that / (slash) activated the Quick Find in Firefox and its close relations, but I didn’t know that ' (apostrophe) activated a Quick Find (in links). That’s quite helpful when jumping through web admin interfaces where I know which links I want, I’m using the two-handed keyboard (not the one-hander) and prefer not to jump between keyboard and mouse.
I don’t see that on the menus anywhere, so how was I meant to find it without digging through the manuals? What other speed-up shortcuts are lurking in common applications? Is there something like Emacs‘s where-is function (c-h w) for Firefox that will tell you where to find something?