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Re:WebExtensions FAQ by wldcordeiro on Wednesday August 26, 2015 @12:28PM (#10124060)
I think a smarter approach would be introduce this new API and only deprecate the portions of XUL that haven't been replicated in the new API. Once you reach parity you do the rest as you suggest.
Re:WebExtensions FAQ by ZenoArrow on Wednesday August 26, 2015 @01:03PM (#10124386)
Depreciating functionality doesn't mean the functionality goes away immediately, it just means it's not recommended to use.

Mozilla isn't stopping people from using XUL by depreciating it, they're suggesting that developers should avoid it, as it'll eventually be taken away. The two extension systems will both be available until a sufficient portion of Firefox extensions have been migrated over to the new APIs.

Or to put it in another way, good news, they're doing what you said!

Re:WebExtensions FAQ by joshuacc on Wednesday August 26, 2015 @02:39PM (#10125131)
I think you mean deprecating, not depreciating. :-)
Re:WebExtensions FAQ by ZenoArrow on Wednesday August 26, 2015 @02:47PM (#10125177)
Yes. :-)