[kibwen]

If this is referring to Electrolysis, that has been in stable Firefox for about a year now, and it was an initiative whose planning began in 2009. Seven years from inception to delivery is a long time, and indeed was largely attributable to trying to find ways to avoid breaking every extension in the universe, and then being forced to break every extension anyway, and then laboriously fixing up all the broken extensions over a very long period. After such a grueling task I don't blame them for coming to the painful conclusion that Firefox simply can't keep pace with other browsers while maintaining the all-pervasive legacy extension system, especially since Electrolysis was just a first tentative step towards effective multiprocessing.

Indeed, I'm one of the people who has suffered from losing legacy Firefox extensions (find me a substitute for LeechBlock, please!), but I can see how much of a burden it was for the developers to compete on performance and security, which I value more. I'm hopeful that Firefox will continue to add sane extension APIs to help close the gap with what was previously possible without regressing to the old quagmire. Fingers crossed, but they've done well delivering so far with 57.