Tampermonkey

Tampermonkey is a free browser extension and the most popular userscript manager. It's available for Chrome, Microsoft Edge, Safari, Opera Next, Dolphin Browser and Firefox.

Tampermonkey will give you much convenience in managing your userscripts. It provides features like easy script installation, automatic update checks, a simple overview what scripts are running at a tab and a built-in editor.
You can also import and export your scripts and settings via some popular cloud storage services (Google Drive, Dropbox, OneDrive).

For a full overview please take a look at the FAQ or just install TM. ;)

Thanks for using Tampermonkey. :)

Permissions

Screenshots

Feedback from users

Reviews and ratings

petr1650 says:

Rating: 5

skvělý, perfektní je to třeba na hru The West

Oct. 12, 2013 - Version 3.5.3630.14
citycomet says:

Rating: 5

Tampermonkey is a SUPER add-on !!!!

Oct. 12, 2013 - Version 3.5.3630.14
step-2 says:

Rating: 5

an essential extension

Oct. 11, 2013 - Version 3.5.3630.14
satano111 says:

Rating: 5

programm ist easy!

Sept. 14, 2013 - Version 3.4.3494
david-lowe says:

Rating: 5

Seems to be the better of the 2 Userscript tools for Opera. Tried the other one and it didn't work for my existing script that was made for Greasemonkey. My script worked fine in Tampermonkey.

Good job folks!

Sept. 14, 2013 - Version 3.4.3494
underrdogg says:

Rating: 5

Ive been using it for chrome hope here the quality is the same!

Sept. 3, 2013 - Version 3.4.3494
nissala says:

Rating: 5

Very good job, WELL DONE!

Aug. 29, 2013 - Version 3.4.3494
sunmooon15 says:

Rating: 4

must have extension , finally available for opera

Aug. 29, 2013 - Version 3.4.3494
chas4 says:

Rating: 4

Can you add the ability to hide the extension from the toolbar

I am trying to add some older UserJS files from Opera Presto days

Aug. 14, 2013 - Version 3.4.3494
azyrion says:

Rating: 5

works great!

Aug. 10, 2013 - Version 3.4.3494