Does IE have a simple, javascript-driven means of extension development like Chrome, FF, Safari and Opera do?

Question

Before giving up on my extensive googling, I thought I'd make a last ditch effort and ask here...

In Chrome, Safari, Firefox and Opera - it's very easy to write browser extensions using javascript (and some native javascript functions to each browser)...

I can't seem to find such an equivalent for IE. I've seen Greasemonkey replacements - most of which only work for very simple scripts.

Does IE9 or 10 support extension development using javascript, rather than C, etc?

I have a pretty large extension working in FF, Chrome, Safari and Opera that I'd be happy to support IE with if it didn't mean a complete rewrite into a different language, but I can't seem to find any sort of IE equivalent of a "content script" or "user javascript" type extension...

Answer 1

Update:

The old Crossrider project died a few years ago and the site/domain has moved on to (¿worser?) things. But then again IE itself has moved on.

But now Tampermonkey supports the Microsoft Edge browser.

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Old obsolete answer:

It's not quite the ease of Greasemonkey or userscripts, but it's also more powerful. You can use Crossrider (archived link) to develop full-on browser extensions that work for IE, as well as Chrome and Firefox.

Crossrider is was coded with javascript/jQuery.

Answer 2

I believe that the only option for IE is to write a Browser Helper Object, which is a COM component normally developed in C++ but it is also possible to use .NET. In other words, it would be a complete re-write.