Release 151 split-view tab group and move fixes

[rebloor]

Description

Updates to provide documentation for:

• Bug 2029099 tabs.group() does not work with split views
• Bug 2027855 Unexpected position of split view tabs after tabs.move()

Including a release note and clarification in tabs.group and tabs.ungroup regarding split views.

[github-actions]

Preview URLs (3 pages)

• /en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs/group
• /en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs/ungroup
• /en-US/docs/Mozilla/Firefox/Releases/151

External URLs (2)

URL: /en-US/docs/Mozilla/Firefox/Releases/151
Title: Firefox 151 release notes for developers (Beta)

• https://bugzil.la/2027855 (1 time) (Note! This may be a new URL 👀)
• https://bugzil.la/2029099 (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2026-04-21 02:04:42)

[Rob--W]

Linkified split view pointing to https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Working_with_the_Tabs_API#working_with_tab_split_views in some cases.

I have not requested to expand that article with a mention of tab groups, since that documentation dos not exhaustively list every API that could move tabs (e.g. windows.create with tabId is not mentioned either), and "when someone moves a tab in a split" can already be interpreted to include grouping/ungrouping of tabs IMO.