All userscripts I’ve seen have been completely safe, there is very little to worry about.įinally, userscripts are restricted to the sites they declare themselves to run on, which is always one of the first lines in the script. If someone in the community were to write a malicious userscript, we’d all notice and flag the post for promoting something malicious. The source code to all userscripts is also available.

They generally run with the same permissions that any other script runs in your browser, so if you’re already using the internet, you’re not increasing the risk by that much. However, userscripts operate under strict supervision from your browser. Notice that since GM.xmlHttpRequest can bypass the same origin policy, access musst be explicitly granded in the head of your script: // GM.In theory anything connected to the internet can be hacked, there’s no absolute guarantees in cybersecurity. RemoteScript.innerHTML = response.responseText Let remoteScript = document.createElement('script') Additionally, a GET parameter with the current timestamp acts as cache buster: let url = ` Date())}` Worked around this by fetching the scripts content using `GM.xmlHttpRequest. So the browser would block this script, since it's from a different domain than .ĭuring development, I'd like to get my script without any caching to apply changes immediately. This script should got injected to a third party site like, where it applys modifications. For example, in my case I also have a locally running webserver to develop in an IDE using Tampermonkey for Firefox without requiring any file system access for Tampermonkey from the Browser. doesn't work for me, because Tampermonkey script location and target site where it got injected could be different. Is there a way to prevent the userscript from caching the external script? Or is there any other metatag that can help me? This setup works, but only the first time and when I change my lib.js script, then the userscript still reads the old one. So to be clear, my userscript looks like this: // =UserScript=Īnd my external script looks like this: alert('got it') Īll still very easy for testing purposes. Is there any way around this problem? I've been searching for an answer but had no luck so far. I'm editing the script on my webserver and I really don't want to reinstall the userscript each time I make changes on the included script. I'm currently trying to figure out how I can include a javascript, I have on my webserver, in my scriptish/greasemonkey script and make it reload the script everytime the userscript gets called.

Is tampermonkey beta safe