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PUBLIC MARKS from decembre with tags example & greasemonkey

January 2015

GM - firefox - How to alter this javascript with Greasemonkey? - Stack Overflow

On Firefox Greasemonkey, you can do that with the stupefyingly brilliant (^_^) checkForBadJavascripts utility

February 2014

javascript - Use Greasemonkey to replace links, to images, with images? - Stack Overflow

Replacing links to images is not too hard to do. However, I recommend that you keep the link but display the picture inside it. This is so you can click through if something goes wrong. For example, that sample page you gave has most of the linked images on a dead site. Other linked images only look like they point to images or might be blocked for "hot linking". To make the code robust and easy, we use jQuery and waitForKeyElements. Here is a complete working script that delinks the payload image-links on that sample site: