Firefox and Thunderbird hit the fortnightly release treadmill

Mozilla's Firefox 155 and subsidiary MZLA's Thunderbird 155 have arrived.

Yes, already.

Firefox officially debuted yesterday, although The Reg FOSS desk wasn't offered the upgrade until early evening.

Thunderbird followed several hours later.

If this seems soon after the previous releases, that's because it is.

Mozilla announced Firefox's new fortnightly cadence in July, and MZLA subsequently confirmed that Thunderbird would keep pace.

September marks the start of the accelerated schedule.

Much of the new shiny in Firefox 154 was of interest mainly to the subset of its audience – Windows users and gamers.

This time around, they are again, but to a different subset: the main new features showcased in the release notes revolve around AI features.

The multipurpose Smart Window is now available to more people in more regions, and the LLM-assisted tab-group naming feature that appeared a year ago in Firefox 141 is now smarter.

In the latest update, Firefox can display the number of blocked trackers in the address bar, which sounds like a useful promotional feature if nothing else.

Mozilla is giving it a "progressive rollout," however, and we don't have it yet.

The Firefox containers feature from 2018, which became a built-in function with Firefox 153, now lets you change the order of the containers.

We've not tested this in production yet, but it sounds handy.