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Re:Firefox 57 as the first release where only WebExtensions ... by Kubuxu on Saturday February 18, 2017 @06:58PM (#13677369)
Yup, this is one of the developers that took it serious [0]. You can see, he started preparing in August of 2015. If other developers did that, this info wouldn't be a problem.

[0]: https://github.com/lidel/ipfs-firefox-addon/issues/20

Re:Firefox 57 as the first release where only WebExtensions ... by trome on Sunday February 19, 2017 @04:59AM (#13678988)
IPFS is a one off though, it has multiple paid developers who can spend their full time rewriting their addons at the drop of a hat. Plus that IPFS addon didn't require deep access to Firefox's internals, which many popular addons do.
Re:Firefox 57 as the first release where only WebExtensions ... by Kubuxu on Sunday February 19, 2017 @06:46AM (#13679254)
This addon is not worked on by paid developers.

> didn't require deep access to Firefox's internals

Quite contrary, it needs to handle new URI schema, override URL origin policy, scan pages, do DNS queries and so on.