Mozilla announced plans to officially support the next-generation image format “JPEG XL” in its upcoming “Firefox 157” release. The browser will use a Rust-based decoder developed by Google, and with Chrome’s team reportedly leaning the same way, the major browsers look set to fall into line by the end of 2026. WebP and AVIF have so far been the go-to successors to JPEG, but reactions in 5ch threads were mixed — some welcomed the news with comments like “guess WebP’s going away,” while others were cooler on it, saying things like “just another format to deal with” or “isn’t WebP/AVIF good enough already?”
Firefox reveals plans to support “JPEG XL”
Mozilla has announced plans to officially adopt the next-generation image format “JPEG XL” in Firefox 157.
It will use a Rust-based decoder developed by Google. Google Chrome’s development team has indicated similar intentions, meaning “JPEG XL” could see broad support across major browsers as soon as within 2026.
Source: atmarkit.itmedia.co.jp / Original article here
Same reason you're no good, right?
By the time about 1/10 of the file has loaded you can already sort of make out the image
At this point its image quality and compression ratio aren't great. The mosquito noise around text and fonts is especially annoying, and reds can sometimes degrade too.
Only copyright trolls (lit. "893," slang for yakuza) will be happy about this — it's just an inconvenient garbage format.
It's basically just JPEG though
Compresses even smaller and cleaner than WebP while keeping very high quality.
Nothing but upsides. WebP's probably done for.
Same story as the 2,000 yen bill (a banknote that was minted but never really caught on in circulation).
Isn't this article about Chrome supporting it too, with Firefox now officially deciding to support it as well?
JPEG already has progressive loading too. It might get picked up more as a WebP replacement, but JPEG's too widespread to ever go away.
Honestly, for once I'd like to hear a reason it ISN'T bad
It supports lossless too
If you try to keep the quality up in JPEG you end up setting it to 90+, so compared to that this'd probably come out around half the size
progressive
Actually, since WebP and later formats were built to replace the existing ones, they carry over all the options and settings from PNG, JPEG, etc. WebP lets you choose lossless or lossy and set a quality factor too. The "WebP or nothing!" crowd doesn't get that.
Background and key points of this discussion
JPEG XL is an image format that was standardized internationally in 2022. It supports both lossless and lossy compression, can convert existing JPEG files without any loss of quality, and features progressive display that renders images starting from a low-resolution version, among other traits. Google had previously shelved plans to adopt it in Chrome at one point, and during that gap WebP and AVIF gained ground, leading some to view JPEG XL as a “format that got left behind.” With the announcement of a Rust-based decoder this time, previously raised concerns about memory safety have eased, and momentum for adoption has grown in both Firefox and Chrome. Reactions in the thread were split — some are optimistic that “WebP might disappear,” while others remain cautious, arguing it’s “just adding to format sprawl” or that “the existing formats are good enough.” In practice, even when a new format appears, it rarely replaces existing formats like JPEG or PNG right away; OS- and app-level support typically lags behind browser support, so multiple formats are likely to coexist for the foreseeable future.
*This article is compiled as an excerpt/summary from the 5ch (Business News+) thread “Not JPG, Not PNG — Major Browsers Set to Officially Adopt “JXL” Within 2026.”
