The development of `declarativeContent` is currently on hold because the risk of the implementation does not outweigh the potential benefits of it. For more details, see https://docs.google.com/document/d/1KjC2uAV0n5BszbyQjclzp2cLiOhWuKrTmqvqyz5ggKU/preview There are several alternatives to the `declarativeContent` API, such as the `tabs` and `webNavigation` APIs, and using them results in code that is still compatible with Chrome.
Bug 1435864 Comment 6 Edit History
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The development of `declarativeContent` is currently on hold because the risk of the implementation does not balance against the potential benefits of it. For more details, see https://docs.google.com/document/d/1KjC2uAV0n5BszbyQjclzp2cLiOhWuKrTmqvqyz5ggKU/preview There are several alternatives to the `declarativeContent` API, such as the `tabs` and `webNavigation` APIs, and using them results in code that is still compatible with Chrome.