Firefox ESR 91: new ESR version will be released tomorrow

Mozilla plans to release new versions of its Firefox web browser on Tuesday 10, 2021. The organization does so every 4-weeks on average, but tomorrow's release is special, as it is the base for a new ESR, Extended Support Release, version of the web browser.

Firefox ESR versions are maintained for a longer period compared to stable releases. One core difference is that they are released with a specific feature set that is not changed during the lifetime. Security updates and bug fixes are released, but features are not added usually until the next ESR version is released.

The last Firefox ESR version, Firefox 78 ESR, was released in June 2020, and it replaced Firefox 68 ESR in September 2020.

Two Firefox ESR branches are released side-by-side for a period of two or three releases usually, before the older one is not updated anymore; this gives organizations and home users enough testing and migration time.

Firefox 91 ESR won't replace Firefox 78 ESR right away. The latter will see two additional releases, Firefox 78.14 ESR and Firefox 78.15 ESR before it will be discontinued; this will happen in October 2021.

firefox 91 esr

Firefox 91 ESR marks the beginning of a new base for extended support releases. The version will be supported for about a year.

Organizations and home users who are running the current ESR version may update their installations to the new version. The upgrade is a major one, considering that Firefox 91 includes all the functionality that Mozilla introduced since the release of Firefox 78 ESR.

Major changes include the new interface design that Mozilla rolled out recently, improved privacy protections, removed Adobe Flash support, support for new operating system versions, e.g. Mac OS Big Sur, and a lot more.

Here is a short list of changes that will be introduced in Firefox 91 ESR:

Firefox ESR is also the base of the Tor Browser. The developers of the Tor browser will update the browser to the new ESR version as well, eventually.

Firefox ESR users may want to test the new version before they upgrade existing installations and profiles. You could download and run the portable version of Firefox ESR from Portable Apps for testing; it does not interfere with the active installation, as it is portable, and you could import the Firefox profile from the installed version to the portable version to test it.  Firefox ESR versions are not upgraded automatically to a new base version, this begins with the second release after the release of the new base version.

Closing Words

The new Firefox 91 base for ESR releases introduces significant changes to various features of the browser. Some features are removed, e.g. Flash support is gone for good and the interface redesign has removed some options, but there are also new features, such as improved privacy protections. Organizations who rely on these features lose another option, and need to look elsewhere, e.g. Pale Moon, for support.

Now You: Do you use the ESR version of Firefox?

Summary
Firefox ESR 91: new ESR version will be released tomorrow
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Firefox ESR 91: new ESR version will be released tomorrow
Description
A new Firefox ESR Extended Support Release version, Firefox 91 ESR, will be released this month. Find out what is new and changed in the release.
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Ghacks Technology News
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Comments

  1. Anonymous said on August 9, 2021 at 9:29 pm
    Reply

    I hope that “browser.proton.enabled” will still be configurable.

    1. Anonymous said on August 12, 2021 at 10:41 am
      Reply

      It isn’t.

  2. ULBoom said on August 9, 2021 at 10:16 pm
    Reply

    I’ll update when I have to. I played with fast release 90 a month or so ago, in beta or something and it behaved fine. Prefs from ESR 78 seemed to transfer OK. Easy to remove, change, disable all the new improved stuff such as the Googlus Giganticus interface. Flash is already gone from our systems and the security stuff done outside the browser.

  3. Yuliya said on August 9, 2021 at 11:22 pm
    Reply

    New UI and other unnwanted features nobody asked for, more telemetry, forced updates, less features; and yet this VSync bug is still present: https://i.imgur.com/IBqwbzE.jpg
    An issue so old, it’s laughable. Funnily, this means Firefox is still not Vista or newer compliant. They’ll fully run it to the ground and this bug will still not be fixed by then.

  4. yanta said on August 10, 2021 at 3:45 am
    Reply

    I would argue that esr is the “stable” version, where as the ever changing retail channel that gets a bug fix after almost every new release is not so stable.

    Now begins the months long testing of 91esr to figure out how to add back everything they’ve taken out, and all the settings that have been deprecated to try to turn it back into a useful browser.

  5. Dave said on August 10, 2021 at 5:40 am
    Reply

    When you use the phrase “privacy protection” in the same sentence as “browser” what it really means is that that browser is protecting it’s own monetary interests by trying to prevent your data from being harvested by anyone but them.

  6. Proudly Brave said on August 10, 2021 at 8:27 am
    Reply

    This browser is excellent because it is not racist or homophobic. Whether that results in a good browsing experience is not debatable, homophobic, islamophobic and racist.
    I only wish it would be offered without Google search, but I guess that’s too much to ask for.

    1. CHUDs GTFO said on August 10, 2021 at 10:36 am
      Reply

      Are you okay? It must really suck to feel like cultural progress comes at your personal expense. Kind of sad, but no one feels bad for you.

    2. ShintoPlasm said on August 10, 2021 at 10:39 am
      Reply

      How can a browser be racist or homophobic? Do explain.

  7. Sefer_HaMalbush said on August 10, 2021 at 11:16 am
    Reply

    Waiting for LibreWolf to release.

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