https://hacks.mozilla.org/2013/11/live-editing-webgl-shaders...
https://hacks.mozilla.org/2013/11/live-editing-webgl-shaders...
Anyways, powerful new tools for developing WebGL.
Edit: As Jare mentioned (https://news.ycombinator.com/item?id=7178225), the editor is disabled by default. Check Toolbox options.
While I'm whining, is it possible to show the console at the same time as viewing the source for files? The fact that I have to switch between the console and source tabs in FF is pretty much the only reason I use Chrome for debugging.
For the vertical split thing, opening a bug is the easiest way to get the feature in [1].
[1]: https://bugzilla.mozilla.org/enter_bug.cgi?product=Firefox&c... (this is a URL with the right bugzilla component. just log in, fill the blanks and submit)
This split console feature landed in 28 (so it is moving up to Beta now): https://hacks.mozilla.org/2013/12/split-console-pretty-print...