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Why rewrite it in another language? It isn't currently broken.

Things that are not broken do not need rewriting.

> Why rewrite it in another language? It isn't currently broken.

You need to support that claim. The people who actually work on Firefox have a list of reasons why they made this decision:

https://blog.mozilla.org/addons/2015/08/21/the-future-of-dev...

Why are we to believe that you are better qualified to make that call?

Maybe they decided there's too much technical debt and they can't make changes to the browser as fast as they wish they could in the current framework?

Not 'broken' in a traditional sense but still a valid reason to rewrite.

Yeah, but there is a trade-off involved. If you spend 3 years rewriting your toolkit, then the time you will eventually save on further changes has to offset those 3 years, and that's very hard for most projects.

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