I think most of you must be knowing about Greasemonkey.Well even if you don't know nothing to worry about.
Greasemonkey is one of the most popular Firefox extensions, allowing users to easily customize any web page, remove annoyances and enhance user experience in general, the functionality Greasemonkey provides is only limited to Firefox though.
But now this facility can also be experienced by the Internet Explorer, Opera and Safari Users also by using the method given below:
Running Greasemonkey Scripts in Internet Explorer
For Internet explorer users there are quite a few alternatives for Greasemonkey which will allow you to run user scripts.
Trixie is probably the best Greasemonkey alternative for Internet Explorer users. You can run any Greasemonkey scripts on IE using Trixie.
IE7Pro is a popular add-in for Internet Explorer which enhances the overall experience while using Internet explorer. They also have a feature where you can install and run user scripts, just like you do with Greasemonkey. You can download user scripts for IE7Pro from IEScripts.org.
Greasemonkey for IE
Previously covered Greasemonkey For IE does the job pretty well running user scripts but does not have many user scripts to boast of yet.
Run Greasemonkey Scripts in Opera
For users who want to run Greasemonkey scripts in Opera you need to rename the original script to end with ".user.js" and add the script to be run by Opera. Contridentuallity has a great tutorial on running Greasemonkey scripts in Opera.
Run Greasemonkey Scripts in Safari
For all those Mac users browsing on Safari, there is a nice alterative called Greasekit a user scripting engine for Webkit applications. Greasekit allows Safari users to download and run user scripts.
Simple Help has a in-depth tutorial on how you can install and run Greasemonkey scripts in Safari.
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