Don't work with FF 28.0 Rated 4 out of 5 stars

Addon not work

For FF 27+ (fixed version) Rated 5 out of 5 stars

Hi cool add on Rated 3 out of 5 stars

Like it, but
It makes some conflicts with firebug in editing properties.

Don't work with FF 27.0.1 Rated 1 out of 5 stars

Addon not work

*Correction* -- Workaround for Mac, FFox 27.0.1. Rated 4 out of 5 stars

Er, correction to my post here:

... Path should have "Library" in it:
Users/USER/Library/Application Support/Firefox/Profiles/SOMECODE.default/extensions/

For the users whom are not so techie I noticed in these reviews, keep in mind Library is a hidden folder by default, so you'll need to reveal hidden folders in your Mac's settings.

This user has a previous review of this add-on.

Doesn't work in 27.0.1 Rated 1 out of 5 stars

I have read all of the reviews here and it still doesn't work. I followed the advice by LEOING on two different machines on how to install from Git, but neither install worked. I am on FF 27.0.1.

Too bad, this used to be an AWESOME plugin. Now I have to use PerfectPixel in Chrome. This should REALLY be built directly into Firebug!

previous post cool Rated 5 out of 5 stars

diamond advice, I also found a way to revive the button I perezalivat files from the expansion of older versions

This user has a previous review of this add-on.

Rated 5 out of 5 stars

Thanks for the github tip! Here a howto:
Go to
Click "download zip". Decompress somewhere. Browse to srcExtension/ folder. Search for your pixelperfect addon destination, it's about here:
Content should looke similar (chrome folder etc). Close Firefox. Replace old addon files with the ones from the zip. Restart Firefox. Smile (important).

Просто не работает Rated 1 out of 5 stars

установил раз — заглючил фаербаг — показывалась только вкладка этого дополнения. выбираю изображение, оно не показывается поверх страницы. элементы управления не работают.
снес, установил второй раз — то же самое, но вкладки фаербага заработали.

Fix please! Rated 1 out of 5 stars

I agree with capnbob, as a non techy I have absolutely no idea how to add the fix in git hub. Shame, I could really use this too.
Please fix this!

Fix works Rated 5 out of 5 stars

This is still an awsome addon for anyone who does web development - it amazes me that firebug have not ported it into the core.

However, I would agree with other posters that the extension has become more and more unstable, which is a shame. On the bright side although the current V1.8 does not work with FF25 the fix suggest in the git hub fork does resolve the issue. However the instructions are non existent and my prove to be impossible for non techies to fathom out. In that respect can I please as the developers to rush out a fresh version?

This user has a previous review of this add-on.

Dont love this no more Rated 1 out of 5 stars

Have used this alot, but has become unstable over time.

Now does not work at all.

Any one know an alternative to this

Rated 5 out of 5 stars

This extension is awesome but AMO version is broken.

As mentioned by a previous user Aleksey, The github fork has all the issues fixed:

Rated 1 out of 5 stars

The add on is taking over firebug
Firebug now opens on the PP screen and often I am unable to switch tabs without selecting an item to inspect

It is the shows as the first window open even thought I disabled it

I had to remove it to stop the page from showing.

It is broken now.

Rated 4 out of 5 stars

I love this extension. All bugs fixed on github
Works with latest version of Firefox and Firebug

Another point of view Rated 5 out of 5 stars

For everyone who loves this extension and still wants to use it but leave the last updated firefox as is I have a solution that works for me.

1. search on google for a portable firefox version, prefferably old than actual, for example version 13.0.0 you can try with some newer if you want. This doesn't require install or downgrade your current version of Firefox, just run it and when you are done exit. Is the portable version, you can even take it on your usb stick.
2. install pixel perfect and other extensions that you want
3... done :) happy coding

Yes, I know there can be some changes from an old version to the last version of Firefox... but in the visual part firefox is the same, not big changes, I am right?

Rated 1 out of 5 stars

Doesn't even work. What a waste of time! Frankly, this pisses me off. It shouldn't even be listed in the directory if it doesn't work.

Sorry Rated 1 out of 5 stars

Completely useless for me on FF 23.0.1. Can't toggle images.

Rated 2 out of 5 stars

It's really a long time to wait for the new version.I'm using another tool instead.

Rated 5 out of 5 stars

Sometimes updates to this plug-in take long to be published, but it's great!