After seeing a lot of backlash over Waterfox adding Brave's adblock engine:

It looks like Waterfox is piggy-backing off of Firefox’s implementation (great!).

And it's been there for a little while.

Mozilla bundled adblock-rust (Brave’s Rust-based adblock engine, the same one my team works on) into Firefox. Pretty exciting to see them finally start taking ad & tracker blocking seriously; I didn’t think I’d see this day. It landed in Firefox 149 via via Bugzilla Bug 2013888.

...evidenced by the stale mothballed bug report (linked). This should be an easy bug. It should be a no-brainer that triggers a Mozilla dev to say “of course, no problem.. job done”.

It’s kind of like when Trump was asked to condemn the KKK. He had to pause and think.

Or when Peter Thiel was asked:

“Hey, what do you think? Should humanity survive?” And it took him five, six, seven seconds to say, ‘Yes, I guess so’.” (from Rutger Bregman’s lecture)

A year after the bug was raised, Mozilla has not made a decision.

There used to be a feature whereby a bookmarked page could be flagged for offline use. Then when you visit that page, it instantly renders the page regardless of whether you are online. Was that removed?

There is a «File→Work Offline» tickbox, but that’s apparently something different because it gives no way to specify which pages should function offline.

With Firefox 148 hitting the stable channel across all supported platforms, Mozilla has promoted the next major version of its open-source, free, and cross-platform web browser, Firefox 149, to the beta channel for public testing.

Firefox 149 looks like a minor update that only introduces the long-anticipated native Split View feature, allowing users to view two web pages side-by-side in one tab. The Split View feature can be enabled by right-clicking on a tab, and you can also add a split view to a new group.

The Split View feature has been in testing in Firefox Nightly until now, and we can only hope it will land in the final Firefox 149 release since it’s a welcome addition for increased productivity. Split View can be enabled in Firefox 147 and Firefox 148 from about:config by setting the browser.tabs.splitView.enabled option to true.

Mozilla has released Thunderbird version 148 of its widely adopted free and open-source desktop email client, now available for download.

In this update, one of the most visible changes is that the “Favorites” folder can now be selected directly as a destination when using the “Move To” and “File” actions.

On the authentication front, NTLM is now available for Exchange Web Services accounts, plus Yahoo, AT&T, and AOL accounts have been migrated to PKCE.

A month after releasing version 147, Mozilla has launched Firefox 148, the latest update to its popular open-source web browser, now available for download.

The main new feature is the AI Controls section in Settings, which gives users a clear and central way to manage or completely block AI features in the browser.

A visible “Block AI enhancements” switch lets users turn off both new and existing AI functions. By default, AI enhancements are blocked, but users can enable specific features if they want. Mozilla says more AI controls will be added in future updates.

Mozilla has released Thunderbird version 147 of its widely adopted free and open-source desktop email client, now available for download.

One of the most visible additions is a new “Show Full Path” option for the folder pane when using compact view modes. This makes it easier to navigate complex mail setups by displaying the full folder hierarchy instead of truncated names.

Alongside this, Thunderbird 147.0 introduces a new preference, mail.useLocalizedFolderNames, allowing users to control whether special folder names are localized. In addition, special folders are now localized using a restricted and more predictable set of names.

Beyond the Firefox browser to see more changes under its new CEO, the Thunderbird mail client is also expected to see some big changes in the new year.

Thunderbid today published their 2025 year in review while also offering a look ahead to 2026.

This year brought Thunderbird 140 as their newest Extended Support Release (ESR), native Microsoft Exchange email support in Thunderbird 145, continued work on their mobile story, and also the introduction of Thundermail and Thunderbird Pro.

Especially as demand for video grew, the web needed a next-generation codec to make high-quality streaming faster and more reliable. H.265 promised efficiency gains, but there was no guarantee of another OpenH.264-style arrangement. The risk was another fragmented ecosystem where browsers like Firefox couldn’t play large portions of the web’s video.

To solve this, Mozilla joined other technical leaders to form the Alliance for Open Media (AOM) in 2015 and started ambitious work on a next-generation codec built from Google’s VP9, Mozilla’s Daala, and Cisco’s Thor.

Mozilla has released Thunderbird version 146 of its widely adopted free and open-source desktop email client, now available for download.

On the new features side, the update introduces UI-based configuration of a preferred OpenPGP keyserver, giving users clearer control over where their public keys are fetched and published. Alongside this, Thunderbird migrates all existing logins to modern AES-based cryptography, improving security without requiring user action.

Last year, the Firefox team set out to test something fans requested: choosing a custom app icon. The experiment was simple. Offer a small set of options and see how people use them.

Thunderbird’s plans to expand beyond the desktop client took another step forward this month as the project published its latest progress report on Thunderbird Pro – the new Mozilla initiative to offer an open-source alternative to Gmail and Office 365, for which we informed you about at the beginning of April. Here’s where things stand so far.

Testing of Thundermail, the project’s email hosting service, has reached production level. Internal users have begun onboarding, allowing the team to validate account setup, support workflows, and delivery reliability. The refreshed Thundermail dashboard is also in place, giving users controls for custom domains, aliases, and account settings.

We recently shared how we are approaching AI in Firefox — with user choice and openness as our guiding principles. That’s because we believe AI should be built like the internet — open, accessible, and driven by choice — so that users and the developers helping to build it can use it as they wish, help shape it and truly benefit from it.

Mozilla has released Thunderbird version 145 of its widely adopted free and open-source desktop email client, now available for download.

One of the most notable additions is that the app now supports Exchange Web Services natively. This long-awaited feature simplifies the connection to corporate email systems, eliminating the need for third-party extensions. The update also allows manual configuration of EWS accounts directly within the Account Hub.

According to marsf, the long-time locale leader of the Japanese SUMO team, the decision to disband was triggered by the recent introduction of an automated translation system known as Sumobot. Deployed on October 22, the bot began editing and approving Japanese Knowledge Base articles without community oversight.

In a message posted to the SUMO discussion forum, marsf explained that Sumobot’s behavior was unacceptable for several reasons:

• It disregarded Japanese translation guidelines, resulting in literal and sometimes inaccurate text.
• It overrode existing localizations, effectively erasing community-approved work.
• It automatically approved machine-translated content for all archived articles within 72 hours, removing the review window for human contributors.
• It operated without consultation, control, or communication with the Japanese community.