"Manifest V3, or Mv3 for short, is outright harmful to privacy efforts," wrote EFF staff technologist Daly Barnett earlier this month. The EFF has been particularly emphatic about scolding Google over Manifest v3, having only a week ago issued a similar warning. The Chrome Web Store will stop accepting Manifest v2 extensions come January 17, 2022, and plans to disable existing Manifest v2 extensions come January, 2023, though that date may slide: Google developer Devlin Cronin in 2019 said, "We will not remove support for Manifest v2 until we are confident in the platform."Īt the moment, there’s not much confidence in the platform outside of Google and the other major browser makers who like the idea, with some caveats – Apple, Microsoft, and Mozilla. The hope is that Google will fix the bugs and fill in the platform gaps in time, but time is running out. background tasks, WebSockets, user script extensions, and WebAssembly are all broken under Manifest v3 presently. According to Miagkov and Cyphers, observational webRequest, native messaging. More than a few extension developers have voiced their concern to the EFF, such as Krzysztof Modras, director of engineering and product at Ghostery: "Nearly all browser extensions as you know them today will be affected in some way: the more lucky ones will 'only' experience problems, some will get crippled, and some will literally cease to exist."
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The Google Groups "Chromium Extensions" group is full of developers voicing frustration about functionality that they cannot (or, where alternative Manifest v3 APIs exist, don't understand how to) replicate under Manifest v3.įor example, a school district administrator posted last month about trying to rewrite his extension under the new APIs and finding that his extension can no longer use geolocation to track lost or stolen devices or monitor battery percentage to know when a battery needs replacement. It's not just high profile extensions related to content blocking and privacy that are being affected. Firefox to adopt Chrome's new approach to extensions – sans the part that threatens ad blockers.Ad-blocking browser extension actually adds ads, say Imperva researchers.As Google sets burial date for legacy Chrome Extensions, fears for ad-blockers grow.But what about nice ones that can be hijacked? This new tool spots them
"Google's Manifest V3 is trying to solve a performance issue that does not exist," the company said last week.
A 2019 study by Ghostery found the overhead hit imposed by ad blocking extensions is in the sub-millisecond range.
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Google maintains that it needs to move from a persistent model to an event-based (where tasks start and stop) to allow Chromium or the host operating system to free up computing resources in order to prevent the end user's device (particularly a resource-constrained mobile device) from slowing to a crawl due to poorly coded extension.īut Google's performance claims have been challenged. On top of this, there are many more technical changes in Manifest v3 that affect what extensions can do, like the replacement of background pages (processes that persist in the background) with " service workers," which only run in the background for a limited period of time.
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