+CC :zombie per bug 1496505 comment 9 in case he has concerns about backing out here, or further thoughts on whether/why extensions might still need our current approach rather than being able to use `web_accessible_resources` to expose resources for their injected elements to make use of.
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+CC :zombie per bug 1496505 comment 9 in case he has concerns about backing out here, or further thoughts on whether/why extensions might still need our current approach rather than being able to use `web_accessible_resources` to expose resources for their injected elements to make use of. (See more thoughts on this in an inline comment on the phabricator page: https://phabricator.services.mozilla.com/D252611#8726869 )