I want to make a greasemonkey type script for firefox that runs before the scripts on the page. Greasemonkey scripts run after scripts on the page, so that won't work. The reason I need this is because I want to edit one of the scripts on the page. Specifically, I want to delete a script that forces the page to load inside a frame since having the page inside a frame breaks F5 (Pressing F5 makes the page jump back to the front page instead of reloading the current page). Also, I don't want to load the page through a proxy with AJAX and switching to chrome/opera is not an option either. I was thinking maybe the Jetpack add-on would work but it seems to only have the same event that greasemonkey uses, DOMContentLoaded. Any ideas?
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**IF** Opera was an option, than you could have simply renamed your `*.user.js` file to `*.js` and it would run before any content had even started loading. – c69 Dec 18 '11 at 00:47
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I know, but I don't use opera as my browser. Since I've highly customized firefox, switching and still having everything the way I want it would probably be impossible. Installing and using another browser for just 1 site seems a little silly. – Telanor Dec 18 '11 at 03:33
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[edit 2013] Use the page-mod module of the Add-on SDK with contentScriptWhen = start.
older: Right, only newer Firefox builds (currently 3.7 nighlies, may later be added to 3.6.x) have support for running custom scripts before content-specified scripts. I wrote a prototype Jetpack-SDK module to take advantage of the new notification.
Is it a <script src> or an inline script? In the former case it can be blocked with a content policy (something adblock-like).
Nickolay
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Interesting. I'll see if I can figure out how to get it to work. The script is an inline script. – Telanor Apr 10 '10 at 01:59
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Could you add a reference to an example for doing what @Telanor is asking? – Jaime Hablutzel Apr 05 '13 at 23:51