Support new `splitViewId` in `tabs.Tab` (Firefox >= 149)
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Description
Feature Request
https://blog.mozilla.org/addons/2026/04/23/webextensions-api-changes-firefox-149-152/
Firefox 149 introduces a new read-only splitViewId property on the tabs.Tab object to expose Firefox’s new split view feature (where two tabs are displayed side-by-side in one window).
I’ve read quickly but I don’t think the other changes require a change in WXT.
Is your feature request related to a bug?
N/A
What are the alternatives?
N/A
Additional context
N/A
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by locating how WXT represents or exposes the browser tabs.Tab API, then compare it with the Firefox 149 documentation linked in the issue. Done means the read-only splitViewId property is supported for Firefox 149 and later without affecting existing browser support; run the relevant test suite if one is present.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- tooling
- Issue type
- Feature
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 68/100