Firefox 67.0.1 Release Information

Martin Brinkmann
Jun 3, 2019
Updated • Jun 4, 2019

Mozilla plans to release a new stable version of the Firefox web browser soon. The new version, Firefox 67.0.1, updates stable versions of the web browser.

The update is not available yet but Firefox users will get it as part of the web browser's automatic update system or as a standalone download and installation.

Administrators can install the standalone version over an existing version to upgrade it without losing any of their data.

Mozilla released Firefox 67.0 on May 21, 2019. The new web browser introduced WebRender support to a fraction of the user base and included performance improvements.

Update: Mozilla published release notes on June 4, 2019. The new version includes a change that enables Enhanced Tracking Protection for all new installations, and adds a new "set of experiences" that highlight certain benefits of Firefox. The experiences will roll out to English, French and German browsers starting June 4, 2019. End

Firefox 67.0.1

The Firefox 67.0.1 release notes are not out yet and there is surprisingly little information available at the time as to what the update fixes in the stable version.

A quick scan of Mozilla's bug tracking site Bugzilla@Mozilla returned one issue that Mozilla fixed in Firefox 67.0.1. The issue, filed under bug 1554029, suggests that Firefox's downgrade detection failed for non-minor to minor versions upgrade.

Firefox would see the upgrade from Firefox 67.0 to 67.0.1 as a downgrade and trigger the downgrade warning prompt in that case to warn users about potential conflicts that may arise out of this.

Mozilla added a compatibility check to Firefox to prevent data corruption issues when administrators downgrade Firefox to an older version. Downgrades may lead to data corruption and load errors if the version Firefox is downgraded to uses different formats or data types than newer Firefox versions.

All Firefox users who would upgrade the browser from Firefox 67.0 to Firefox 67.0.1 would be informed by Mozilla on the first launch after the upgrade that they were about to launch an older version of Firefox and that that warning prompt prevented that from happening.

The prompt would not look too good and would cause lots of confusion among users as it offered only two options: create new profile or quit. Firefox users would not be able to use the browser with the old profile or use it at all as a consequence.

The issue is caused by a math error when comparing the old version and build IDs to the new versions as explained on the Bugzilla listing by Dave Townsend.

We build compatibility versions as <appversion>_<appbuildid>/<platformbuildid>. where the build ID's by default are a numeric representation of the date that the build happened.

Previously we attempted to mangle this into a valid toolkit version by converting to <appversion>.<appbuildid>.<platformbuildid> if the build IDs were the expected length. We also split each build ID into two version parts since the version comparator couldn't handle their full size.

This mangling fails when comparing a major version with a new patch version:

<majorversion>.<appbuildid>.<platformbuildid> gets compared to <majorversion>.1.<appbuildid>.<platformbuildid>. Unless that patch version (1 here) was greater than the build ID (currently in the tens of millions) the patch release would appear to be older than the previous version.

It is unclear if Firefox 67.0.1 addresses other issues. We will update the article once the official release notes are published by Mozilla.

Firefox 67.0.1 Release Information
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Firefox 67.0.1 Release Information
Mozilla plans to release a new stable version of the Firefox web browser soon. The new version, Firefox 67.0.1, updates stable versions of the web browser.
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  1. Robert said on June 7, 2019 at 1:38 pm

    I don’t know if this is a bug or not but my homepage won’t load anymore without hitting the refresh arrow with Firefox 67. Seems like they have got nothing better to do than mess with the browser.

  2. John IL said on June 5, 2019 at 12:34 am

    Doesn’t seem like there are a lot of users buying into Firefox’s privacy pitch of protecting all of us from ourselves on the internet. Chrome gains more users almost every month, Firefox seems to gradually loose them. I just don’t think the privacy pitch is going to get Chrome users to switch to Firefox.

  3. Steve said on June 4, 2019 at 7:14 am

    About the downgrade trigger: is it me or Mozilla lately is doing one mistake after another? They look like 12-year-olds doing an Internet startup on the late ’90s. They better stop messing around and fix the CSP issue with extensions.

    1. Jonas said on June 4, 2019 at 10:23 pm

      What is the “CSP issue with extensions”?

      1. Anonymous said on June 5, 2019 at 11:36 am
  4. Dave said on June 4, 2019 at 7:06 am

    Your post is confusing. You say 67.0.1 fixes the bug it creates?

    1. Martin Brinkmann said on June 4, 2019 at 7:09 am

      The update fixes a bug that would otherwise have affected the upgrade from any major version to a minor version in Firefox (including Firefox 67.0 to Firefox 67.0.1).

  5. Klaas Vaak said on June 4, 2019 at 5:11 am

    Is Mozilla going the M$ Windows 10 way, ignoring users’ wishes and making cock-ups into the bargain? It is certainly beginning to look that way. Is that part of, or due to, a certain strategy? Are they trying to, or are they unconcerned by users jumping ship?

    In the latest Thunderbird version there was also something odd that happened: the lightening add-on was uninstalled during the upgrade, which means tasks and events were lost. Some people were lucky to be able to recover them with reinstallation of the add-on, some, like me, were not. This is off topic, but it concerns Mozilla.

    1. Dave said on June 4, 2019 at 3:17 pm

      I use “Provider for Google Calendar” – this lets me sync Thunderbird with my google calender and everything is still on google should I have an issue with local software.

      This is a secondary effect. The reason for using this addon is so I can share the same calender as my phone.

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