Does not work at all with Firefox ESR. Having used the browser for several months, by now Form History Control should be showing several dozen entries, but it comes up completely blank.
It should work, maybe you are browsing privately and opted not to store history in that case? Or maybe you enabled the whitelist option and the page where you enter your text is not whitelisted. Note also that some webpages use complicated html/javascript magic that renders extensions like this useless.
