Firefox will put into effect Chrome’s Manifest V3 extension spec, however nonetheless improve outdated advert blocker method

Manifest V3 is the most recent specification for construction Chrome extensions. The replace was once debatable in that it affected advert blockers, however Google maintained that privateness was once the concern. Mozilla introduced the day prior to this that it might improve Manifest V3 extensions in Firefox to “take care of a prime stage of compatibility to improve cross-browser building.”

In enforcing Manifest V3, Mozilla “will diverge from Chrome’s implementation the place we expect it issues and our values level to another resolution.” Probably the most notable trade pertains to the brand new declarativeNetRequest (DNR) API .

It replaces the webRequest API that, in line with Google, supplies “get right of entry to to doubtlessly delicate person knowledge,” however is utilized by widespread advert blockers. Mozilla’s resolution is to proceed permitting the former method and upload improve for the brand new one in order that builders can “make a selection the method that works best possible for them and their customers.” The Chrome workforce has stated it helps advert blockers at the platform and (*4*)made adjustments to Manifest V3 in accordance with comments.

After discussing this with a number of content material blocking off extension builders, we’ve got made up our minds to put into effect DNR and proceed keeping up improve for blocking off webRequest. Our preliminary purpose for enforcing DNR is to supply compatibility with Chrome so builders wouldn’t have to improve more than one code bases if they don’t wish to.

We can improve blocking off webRequest till there’s a greater resolution which covers all use instances we imagine essential, since DNR as recently carried out by way of Chrome does now not but meet the desires of extension builders.

In different places, the Firefox developer concurs with Google’s determination to verify extensions don’t necessarily stay open a complete web page within the background in an effort to run. As an alternative, the browser will improve provider employees to maintain background duties and match dealing with. 

Mozilla may also put into effect cross-origin protections to help cookie privateness and put into effect a characteristic very similar to Chrome’s that shall we finish customers keep watch over what websites extensions can also be energetic on.

Firefox will get started letting builders take a look at the Manifest V3 improve in This fall of 2021, whilst it’ll get started accepting new extensions early subsequent 12 months. Since it is a “huge platform challenge,” the “agenda is also driven again or behind schedule because of unforeseeable instances.”

We’ve got now not but set a deprecation date for Manifest v2 however be expecting it to be supported for no less than one 12 months after Manifest v3 turns into strong within the unencumber channel.


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