If you're looking to create one addon that works across all major browsers simultaneously, there are tools available like crossrider, kangoextensions, and the addon framework from besttoolbars.net.
By using greasemonkey and converting it into a full firefox addon, I was able to create an addon that performs three simple tasks:
Checking the http status of external links using wiki.greasespot.net/GM_xmlhttpRequest
Manipulating the current page/dom with regex
Injecting an additional hosted javascript for automatic updates
Are there any "cross-browser addon makers" that can accomplish these three tasks? Especially the ability to use GM_xmlhttpRequest for http to external links. It should also be open source, free, or at the very least not include branding in the addons created with it.
Alternatively, what is the simplest way to turn my greasemonkey script into full addons for other browsers like Chrome, Opera, Internet Explorer, Safari, and more? (I imagine this could be achieved with just a few kb of code without needing a complex service like crossrider.)
Thank you!=)