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It sucks? I switched from Chrome last year and am nothing but happy. Who decided it sucks?

Single process for all tabs/sites, no sandboxing, for a start.

I personally won't touch Gecko anymore, and I've been a FF advocate since it was called Mozilla, ha

That article doesn't explain anything about it. The previous Firefox runs (almost?) all extensions impressively well, with little required optimization.

That link doesn't seem to address why plugins need to be restricted to a whitelist? (Which might not be the end-goal, but Mozilla is quite cagey about it)