Installed and working with 55.0.3 Rated 5 out of 5 stars

Apparently effective with Firefox 55.0.3 (64-bit) on FreeBSD-CURRENT.

revision for Firefox 57 needed ! Rated 5 out of 5 stars

Please make an workaround to this Addon so it would work on Firefox 57 upcomming this November !

wtf Rated 5 out of 5 stars

this addon also need compatible to last version.

The irony... Rated 5 out of 5 stars

Unable to download because it's now outdated...

Deeply needed... Rated 5 out of 5 stars

...and working well.Thanks.

For all the addons testers, a must have Rated 5 out of 5 stars

It allows to install incompatible addon. You can do it though the about:config, but this extension is genious. Why is it genious? Because Firefox keep changing the about:config parameter each time it updates, and ask to enter the current version, so no more headache with this.

loving it! Rated 5 out of 5 stars

works on ff version 53!

Excellent Rated 4 out of 5 stars

This add-on working awesome,Thanks for adding!

It worked fine in an old Firefox12 Rated 4 out of 5 stars

A very basic addon which is more user friendly than manually use about:config and set checkCompatibility to false

tnx Rated 5 out of 5 stars

Working flawlessly with v49

in last FF doesn't work Rated 1 out of 5 stars

in last FF doesn't work

Does not work in Firefox48 Rated 3 out of 5 stars

This Addon seems to be enable, but it isn't functioning actually.

Does Not Work In Firefox 48.0 Rated 1 out of 5 stars

Just... does not work in 48. At all. Sits there in the Add-ons Manager right next to compatibility-disabled extensions with no effect on them whatsoever.

Worked Flawlessly Rated 5 out of 5 stars

This was exactly what I needed to reactivate some old, yet still functional, addons.

Plug disappeared and won't reinstalled Rated 5 out of 5 stars

When I upgraded to Firefox 47, this plugin, which had been installed, disappeared from my add-ons. When I tried to reinstall it, it said it installed, but never shows up on my add-ons.

Changes within Firefox are afoot Rated 5 out of 5 stars

While this extension may do what it does just fine, Mozilla has changed their code to require plug-ins to be "signed" before they can work. They will be marked as something that means the original writer never got the xpi registered and approved by mozilla. Recommendation is to switch to Palemoon or another fork of Firefox.

Does not work Rated 1 out of 5 stars

I installed this to firefox to try & stop Fast Dial being disabled by the incompatibility check (even though Fast Dial works flawlessly). Unfortunately this AddOn does not work & Fast Dial is still being disabled every time I reload firefox no matter how many times I reinstall it.

Does what it says on the tin. Rated 4 out of 5 stars

Lets you install addons marked as incompatible. This is great if you have a non-standard browser (like Pale Moon).
I would like to see an option to disable the incompatibility warnings in the Add-on Manager and even allow you to automatically check and install updates in the Manager. Still, it works.

A must for me... Rated 5 out of 5 stars

Until I get KeySnail *possibly* ported (rewritten with same functionality, but not using the code from original straight, just as reference) to the coming "new add-on api" - hopefully this api will support reading keypresses before firefox does anything to them, so can override any regular hotkeys... And there's always bound to be new add-on vs. firefox version issues, so this will be needed... currently many add-ons are incompatible with my Linux Mint 17.1 USB stick, which I boot from some systems...

So this is really needed.

Perfect Rated 5 out of 5 stars

Thank you for this wonderful tool. I love it. It made several supposedly incompatible add-ons work again, including Charamel and Silvermel themes.