Still works fine in FF40 Rated 5 out of 5 stars

I was concerned by the previous review saying the addon no longer works in latest version. In making a limited test of a very old addon, checkCompatability seems to do exactly what it aims to (prevent FF from disabling plugins due only to the version number).

In v40.0.3 I tested it with an arbitrary older plugin: Custom Google Search v1.1.2. I was able to install the plugin, and on restarting, the plugin's custom setup screen appeared and allowed me normal interaction (it is 6 years old, so I couldn't do a "live" test with the current google API). Upon disabling checkCompatibility, the old plugin changed from the yellow "could not be verified" message to the red "has been disabled" one. On re-starting cC, the google plugin was instantly functional again.

The nature of "incompatible" plugins makes it probably impossible to perform a conclusive test, but there is certainly not a complete loss of function due to the recent major upgrade. Sadly, it's probable that any major FF revision will alter enough code that some older plugins will become genuinely incompatible. But if that's the case, we shouldn't give checkCompatibility 1-star reviews, if it still does its job of preventing the strict disabling of plugins marked as deprecated.

Rated 1 out of 5 stars

It does not work in Firefox v40 now :( Is there any workaround solution? Thanks.

Had to downgrade to v39.0.3 in order to get it to work.

must have for PaleMoon Rated 5 out of 5 stars

it's an must-have addon for PaleMoon users to install some addons which says they'r not working (f.e.behind the asterisks).

A must have for all Pale Moon users!! Rated 5 out of 5 stars

Nice! Just what I need for Pale Moon!! Thanks a lot!

Great for Pale Moon Rated 5 out of 5 stars

Excellent tool to get extensions and themes up and running in Pale Moon. I tried manually adding the entries in Pale Moon but it did not help. This extension is wonderful.

Rated 5 out of 5 stars


Extreme helpful for the world-beating and not australis-contaminated PALE MOON Browser Rated 5 out of 5 stars

Thanks, due to this add-on I could install several add-ons in Pale Moon which were wrongly rejected before. :-D
And it DOES SHOW up in the add-on window but under the name "checkCompatibilty 1.3" :-p

got green cats back Rated 5 out of 5 stars

excellent add on. but does not show up in add on window. got my red cats green flavor back after an eternity of constant updates coupled with incompatibility notices. thanks i have my kitties back :). much easier on the eyes.

Worx way better than the 'nightly' tweak Rated 5 out of 5 stars

There R other addons 2 disable compatibility but they R flakey. This 1 actually worx =) Can use it 2 help things like 'extension list dumper' work, etc. This should B a default button in FF, not some addon we have 2 load. Just like 'about config' they can put a warning balloon on it or something. B real.

Great in SeaMonkey Rated 5 out of 5 stars

Works perfectly with no hassles or config needed — good thing, because I doubt I would've lasted more than a month in SeaMonkey if I'd had to manually edit every outdated extension I wanted to try out.

Working great Rated 5 out of 5 stars

Just need to be careful it's not enabling an extension that will give problems

I can´t install it???!!!! Rated 1 out of 5 stars

I think that could be a very good add-on, but i can´t say anything about this, because my FF (FF 28) says that it´s not compartible with my FF-version, but on the add-on site there´s no warning about this and the FF-help was not usefull, too! Please help me!!!!

Rated 5 out of 5 stars

It works on Firefox28. One of the best add-on ever. I can use my old favorite add-ons again. Thanks!!

Rated 5 out of 5 stars

Works as advertised. Simply amazing!

doesn't work 27.0.1 Rated 1 out of 5 stars

doesn't work 27.0.1

Doesn't work anymore. Rated 1 out of 5 stars

Doesn't work in 29.0a2

Rated 5 out of 5 stars

Thanks, it works as described. I found a manual way to disable it on Google, but this is much better than that.

excellent add-on Rated 5 out of 5 stars

when all the other add-ons failed, this was the only one that worked to revive privacy suite on my am able to backup all my passwords before saying goodbye to the awesome extension...

Thank you! Rated 5 out of 5 stars

This extension helped me reinstall Tidy Read on Firefox 25.0. As yet, I have no problems.

not working in daily etc Rated 4 out of 5 stars

still a good idea but TB seems to have changed the names of the compatibility check keys in about:config - I managed to switch off by going in a toggling also the keys with "saved" in them...this could be a drag to do for every daily update though!