Mozilla has blocked the 600% Sound Volume extension for Firefox, citing a policy violation tied to affiliate manipulation, and users are now asking how long it was doing something sketchy in the background.
The extension, which let users push browser audio well past the usual 100% cap, had racked up over 222,000 users on the Firefox Add-ons site before Mozilla pulled the plug. The official block notice says the add-on was disabled for “harmfully altering web content to commit affiliate manipulation.” That is not vague wording. Mozilla specifically means the extension was messing with web pages to redirect or inject affiliate links without users knowing.
A Mozilla community member who looked at the source code confirmed on Reddit that the extension was injecting ads on specific websites. It did not appear to be doing anything beyond that, which is at least somewhat reassuring. No evidence of credential theft or anything more aggressive has surfaced so far.
Still, users who had it installed are unsettled. Several are now asking whether they need to scan their machines or change passwords. The short answer, based on what’s been reported, is probably not. Affiliate injection is bad, but it is a different category of bad from actual spyware.
A separate privacy-focused fork of the same extension has been around since at least 2023, and users in the Reddit thread are pointing each other toward it as a replacement. That fork reportedly strips out the ad and tracking code from the original. A Mozilla contributor noted the write-up on the fork’s listing appears accurate.
It’s worth noting that a Mozilla Discourse thread from 2021 raised red flags about malicious code in the same extension, so this has not exactly come out of nowhere. Whether Mozilla acted on that earlier report or only moved now is unclear.
The X post from one user showing the disabled extension notice has pulled in over 200,000 views, which is how a lot of people are first hearing about this.
For anyone who had it installed, removing the extension and switching to the fork or a different volume tool seems to be the move for now.
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Dwayne Cubbins
1443 Posts
For nearly a decade, I've been deciphering the complexities of the tech world, with a particular passion for helping users navigate the ever-changing tech landscape. From crafting in-depth guides that unlock your phone's hidden potential to uncovering and explaining the latest bugs and glitches, I make sure you get the most out of your devices. And yes, you might occasionally find me ranting about some truly frustrating tech mishaps.
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