Best for userscripts! Rated 5 out of 5 stars

Tiny userscripts really can remove common annoyances from popular sites.

Greasemonkey Rated 5 out of 5 stars

I think what 'the FappinToTheBeat' and 'Glodar' were saying was that they like this app. That makes three of us - my needs are simple and this fulfilled them quickly and easily. Job done quickly and safely. Firefox can be all things to all men as it is designed to use add-ons to allow customisation to suit each individuals needs. Thanks Greasemonkey (and Mozilla).

Rated 5 out of 5 stars

Nice,there is a lot scrpits I coudln't use if there is no this addon.

Thank you !

Rated 5 out of 5 stars

Without Greasemonkey, Firefox is simply incomplete.
This addon is really a savior for many short backs of Firefox.
If you think an addon doesn't exist or not coded for Firefox, stop and check out what you can do with Greasemonkey, ALREADY!

The author(s) deserve a lifetime all expenses paid membership in the legal Dutch hooker shops from us all Rated 5 out of 5 stars

Remember trying to save Motherless, GasXXX, Videarn videos etc before this? Jeeebuz... Author(s) be heroes to all the kinky couples and solo flute polishers and jellyflute players across the interwebs. But wait! There's more! It's also damn useful for actual productive (well, daytime-productive... well, days when you have to go to work or something and you don't work at a faptory) things like making ugly websites surrender their hideous CSS to your every whim, hiding spamimation on web sites, and sometimes even doing things to benefit the other 6.999999999 billion people you don't spend most nights with or who still hang out with you when they know what you do when she goes home for the night - if only cuz we all know she's doing the same half the time, but social norms make us act ashamed. So thanks, Greasemonkies, for helping me save/download the memories of times I pretended to share with ladies I don't know who might possibly even be more perverted than me. Oh, and for making Facebook suck less.

Great 5star Addon until FF 28 Rated 3 out of 5 stars

Due to changes in FF 28, Content Scope Functions no longer run in GM if JavaScript is disabled on the site/page.

Forcing to enable JavaScript on some pages (great benefit to ad-companies & ad-sellers), will enable sites to include JS script to counteract GM scripts. That in turn would render GM obsolete under certain circumstances.

The issue has been reported over a month ago but there has been no response by GM.

Rated 1 out of 5 stars

Very surprised and disappointed there is no Seamonkey support. A deal breaker for me.

Excellent Job !!!!! Rated 5 out of 5 stars

Sorry for joining the party late. Excellent addon and I have been looking for such a thing for long time now.....

Great job developers !!!!!! Keep going....

Incontournable Rated 5 out of 5 stars

Tout simplement incontournable.

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

Rated 5 out of 5 stars

It is easy to use install any script with this add on. Love it ^_^

Rated 2 out of 5 stars

Slows my browser down pretty hard.

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

great Rated 5 out of 5 stars

you can use this addon to inject your own customized javascripts in any website you're visiting, really useful for testing

Rated 5 out of 5 stars

This addon allows to control the appearance and functionality of websites.

total controll Rated 5 out of 5 stars

I often use greasemonkey for total control of the page styling.

Technical but good ... Rated 4 out of 5 stars

Just the thing for people who like to fiddle with things and change them (and get them working). Just a little too hard for the average user to get into to earn a full five stars.

Rated 5 out of 5 stars

I use Greasemonkey to fix all sorts of problems with webpages, to implement tools to help me save time, and to browse the way I want. It completely changes the way you browse certain websites, for the better, hands down!

This review is for a previous version of the add-on (1.14). 

One of the most important apps Rated 5 out of 5 stars

I have used this pretty much since Firefox has had it. Never joined until I needed to say, please bring this to Android. It's one of the most crucial apps for Firefox. Thanks for all you have done over the years for the PC version.

This review is for a previous version of the add-on (1.14). 

Rated 5 out of 5 stars

When you think add-ons are not enough for you, you're going to need Greasemonkey to be able to use custom scripts mainly from and further increase the quality of your browsing experience

This review is for a previous version of the add-on (1.14). 

Rated 5 out of 5 stars

Bardzo przydatny dodatek, chociażby do używania czyichś, już gotowych skryptów. Osobiście go używam i bardzo sobie chwalę. Poznałem go dopiero tydzień temu i żałuję, że nie dane mi było zainstalować greasemonkey wcześniej.

This review is for a previous version of the add-on (1.14). 

Rated 5 out of 5 stars

I love Greasemonkey! It allows me to easily modify webpages within my browser on the fly. It's super fun to play with my favorite websites using this app.

This review is for a previous version of the add-on (1.14).