We've got one or two last perf fixes for the Edge dev tools going in before RTM, but the current perf in Edge (Tech Preview) is about what to expect. Have you tried the latest builds? Always happy to take a message about what to fix or add (this username @microsoft.com)

> Firefox Dev Edition is broken or slow every other build

Then just use release? Dev Edition is the alpha version with some different defaults, based on the assumption that "developers" are OK with an alpha quality build that has some new features faster. If that bothers you, use the release. It also contains the dev tools!

Yah, although some more than others. Microsoft looks ironically (or perhaps fittingly) to be the first into the next lean cycle with Microsoft Edge.

The browser game has changed and become commoditized. Before they went towards being monoliths with everything from email, to apps and games, various services etc. Those parts are being usurped by stand-alone services and apps and need to longer be integrated into the browser. I think that's good! Browsers should focus at being browsers. Better to be a 'la carte than bundle everything under the sun.

Also, I think the vision of HTML as a "universal" app/game platform is slowly dying. We're coming to terms with HTML is really good for somewhat basic presentation and interfaces, but not much more than that.

Although doing advanced stuff is possible it seems we're coming to the realization that it's neither practical nor performant

I think the Servo engine is going to anchor Mozilla's next transition to "lean".

Only in the sense that its missing all the features. People seem to forget when considering current browsers "bloated" that the bloat comes from the webpages containing all the cruft.