Turns out it's not that hard to load arbitrary java code from an addon into Fennec. 1. Apply the attached WIP to fennec 2. Grab the sample addon from https://github.com/staktrace/fennec-addon-javaddon and install it into fennec 3. ??? 4. Profit! If we want to expose this we should probably have some well-defined API interfaces that the addon java code can be compiled against, and that are provided to the addon java code at runtime.

Adding sec-review-needed since this will allow running arbitrary java code in the fennec process.

Holy crap this is a small patch. Exciting!

Comment on attachment 664984 [details] [diff] [review] WIP Brad suggested landing this patch and putting together a proper API for addons in follow-up bugs. So requesting review here.

Comment on attachment 664984 [details] [diff] [review] WIP I am eager to see what projects this feature can open up in Firefox. I wouldn't mind seeing some examples and a brief doc on what can _and_can't be done using this idea. For example, I assume we can run standalone Java code, but can the code interact with the Firefox UI?

Also, we might want to move to a JS ctypes -> JNI approach instead of the Dex:Load JSON message.

(In reply to Mark Finkle (:mfinkle) from comment #4) > I wouldn't mind seeing some examples and a brief doc on what can _and_can't > be done using this idea. For example, I assume we can run standalone Java > code, but can the code interact with the Firefox UI? It should be able to, since it's in the same process.

Landed on inbound: https://hg.mozilla.org/integration/mozilla-inbound/rev/3cc4987101b8 Filed bug 799631 for adding proper APIs.

Dealt with (along with Java APIs in bug 805436) in https://wiki.mozilla.org/Security/Reviews/MobileJavaAddOns