Forgot your password?
typodupeerror
Firefox Operating Systems

Firefox 153 Released (firefox.com) 43

Longtime Slashdot reader williamyf writes: FireFox 153 was released today. The most important user-facing changes are improvements to PDF handling (you can now merge PDFs and add images to them), and HDR video playback (on Windows, provided HDR is active systemwide). Other under-the-hood changes include browser-wide containers and QWAC support. The full list is in the change notes.

But the most important feature is that this version is an ESR and, therefore, defines the ESR feature set for the next year. Why is being an ESR so important, you ask?

1.) ESR, rather than "normal" (a.k.a. Rapid Release), Firefox is the out-of-the-box browser for many important distros, including Debian, RHEL, Kali, Tails, SUSE Linux Enterprise, Slackware, and others.

2.) Many organizations, large and small, standardize on Firefox ESR as their default browser, regardless of the default browser included with their OS.

3.) Firefox ESR is the basis for many downstream projects, such as Waterfox and KaiOS. All these projects will inherit, for a year, whatever ESR brings to the table today.

4.) Many ISVs and SaaS providers, if they certify their wares for Firefox at all, certify for the ESR version only.

Please note that ESR 153 will not be offered as an automatic update until two months from now (ESR 140 will still be supported). If you want it now, you will need to download and install it manually.

Also of note, ESR 115 will be supported until March 2027. If you use an unsupported version of macOS or Windows (like Windows 7 or 8.x), this is the version to get. However, even Mozilla cautions against running a supported browser on an unsupported OS: "Note that Microsoft ended official support for Windows 7, 8, and 8.1 in January 2023. Unsupported operating systems receive no security updates and have known vulnerabilities. Without official support from Microsoft, maintaining Firefox for outdated operating systems becomes costly for Mozilla and risky for users."

Firefox 153 Released

Comments Filter:
  • ESR (Score:5, Insightful)

    by markdavis ( 642305 ) on Tuesday July 21, 2026 @05:48PM (#66250336)

    >"Why is being an ESR so important, you ask?"

    I don't need to ask :)

    We use Firefox ESR at work as the most stable/predictable version for production use. It means we can focus on policies/config/testing on our machines (several hundred, all Linux) and sites, then roll it out and not have to worry about new "features" popping up that cause confusion for users, require additional training/support, or cause unexpected issues for a reasonable period of time (1 year). It is a good release model. Point updates to ESR are just bug fixes and security fixes, no feature or UI changes.

    At home, my machines (all Linux) run the latest non-ESR versions.

    • >"Why is being an ESR so important, you ask?"

      I don't need to ask :)

      We use Firefox ESR at work as the most stable/predictable version for production use. It means we can focus on policies/config/testing on our machines (several hundred, all Linux) and sites, then roll it out and not have to worry about new "features" popping up that cause confusion for users, require additional training/support, or cause unexpected issues for a reasonable period of time (1 year). It is a good release model. Point updates to ESR are just bug fixes and security fixes, no feature or UI changes.

      At home, my machines (all Linux) run the latest non-ESR versions.

      I could not say this when I submited the article, as my particular case is not relevant, but I can say it here:

      I actually use ESR as my daily browser in my personal machines. Can not be arsed to deal at home with unexpected changes each 4 (and begening now 2) weeks... What I do, that most enterprises do not, is that I switch to ESR the day it lands, via a manual install. I want to have a modern browser for at least 4 (and now only 2) weeks. Enterprises normaly wait 24 weeks to test everything before they do

  • Is the person/committee who picked the newer private New Tab colors literally blind or just colorblind? They're horrible.

  • Wasn't this the one that was going to support Vulkan video decoding?
  • by AmiMoJo ( 196126 )

    HDR video is nice, but I hope HDR images are not far behind. These days even mid range phones take HDR images, and conversion to SDR is often sub-par.

  • "The most important user-facing changes are improvements to PDF handling (you can now merge PDFs and add images to them)"

    What the fuck is this feature doing in a browser??

    This makes me even happier that I stopped using Firefox years ago, because these fuckers have clearly lost the plot as to what a browser is supposed to do.

    I'm curious, though, does Firefox still render web pages or has that minor feature been deprecated?

  • In the summary I count 11 instance of the acronym 'ESR', yet nowhere is it defined. Please do better.
    • Eric S. Raymond wrote "The Cathedral and the Bazaar", which inspired Mozilla to make their browser open source. For some reason, this means they name their extended support releases after him.

    • In the summary I count 11 instance of the acronym 'ESR', yet nowhere is it defined. Please do better.

      I can not believe that a 5 digit /. user can not google on his/her own what FireFox ESR means.

      • by mccrew ( 62494 )
        Oh, c'mon, really? The whole point of the summary is that you read it and understand the gist, and not have to research it. Tech writing 101, first time use of an acronym you spell it out.

        All y'all, raise the bar.

      • by mccrew ( 62494 )
        So you're saying that expectations get lower with more digits in /. id? :)
  • by BrendaEM ( 871664 ) on Wednesday July 22, 2026 @11:42AM (#66251546) Homepage
    Cares for my privacy? What about from you?
  • Each time I log into my Vanguard brokerage account using Firefox 140.12.0esr which was the previous esr from Mozilla, I'm greeted with a message that tells me I should really be using the most current browser both for security and features.

    I dinged them on it last week via their chat link and yesterday I received a call from their tech support. The guy had no idea what the esr version was and told me that they would not support it. I tried to explain using many of the points in the post, but it seemed to ha

  • Fired up Firefox and used the help/about. Was on 151 and it was saying that was up to date. Downloaded installer and ran it. Help/about now reports 153 (and up to date). So I guess I'll make sure I just download the installer if I hear about any urgent security updates to Firefox in the future.

  • Maybe it's just me.

    A few years back I was using RedHat, and I gave up on Firefox because videos would not play smoothly.

    Now I am using FreeBSD, and I have recently gave up on Firefox because of a few issues.
    1. Buttons often don't work. For example, the "Show More" button on Google does not work.
    2. Pages often don't load on first attempt. Whether I click on a link, or enter a URL, the pages just don't load of the first try.

    I just gave up. Sorry but, for me, Chrome and/or Chromium, seem to work better.

  • Firefox has be the browser I have used for years, but in the last month it and the New York Times are not working together. Many pages appear to load but do not show. I have reported the problem to Firefox but nothing has changed. I well believe that something in my extensions is causing the trouble. I have adblock plus, dictionary anywhere, noscript, snap links. It is very annoying. In gerneral I find more and more sites that do not work with Firefox.
  • Ever more features to add hacking targets, debugging complexity, and unneeded features. Just make a standalone PDF hack. That I would use. This, I don't need.

It is now pitch dark. If you proceed, you will likely fall into a pit.

Working...