How to re-enable extensions that have been disabled by Firefox 43

I updated Firefox just now and lo and behold, two of my extensions were disabled with no way of flipping them back on. Rather annoying, but I found a solution after a little bit of googling. Somebody created an extension that'll re-enable the ones that have been disabled, but it simply does automatically what can easily be done manually. I tested out the latter and it works, so here's how to do it:

1. Open a new tab (or use a current one, whatever) and type "about:config" (none of the quote marks are required).

2. Click through the warning page and in the search box on the next page, put “xpinstall.signatures.required” and change the value from “true” to “false”.

3. Finally, restart Firefox and boom, the extensions should work again.
 Now bear in mind that this disables the new "signed" security feature that's suppose to protect against bad and potentially harmful extensions, so there's a small risk if you're inclined to install new extensions. At best, this is just a short term workaround until those disabled extensions are signed by their creator or Mozilla allows them to be re-enabled individually. Of course, if whoever created the extension is no longer supporting it, then you're pretty much screwed.

To be honest, I think automatically disabling unsigned extensions is a load of BS. It wouldn't have been a problem to me if Mozilla had included an option to re-enable them, but just unilaterally disabling something I chose to install and use is just plain being an asshole.