Add relnote for adoptedStyleSheets in content scripts (bug 1751346)

[Rob--W]

Description

Add Firefox 153 release note entry to document support for adoptedStyleSheets in content scripts.

Motivation

I have encountered multiple extension developers online and offline that were impacted by a quirk in adoptedStyleSheets support in Firefox's content scripts. I fixed the issue in https://bugzilla.mozilla.org/show_bug.cgi?id=1751346, and it is worth calling out this fix so extensions can stop using their current work arounds.

Additional details

https://bugzilla.mozilla.org/show_bug.cgi?id=1751346

Related issues and pull requests

[github-actions]

Preview URLs (1 page)

• /en-US/docs/Mozilla/Firefox/Releases/153

External URLs (1)

URL: /en-US/docs/Mozilla/Firefox/Releases/153
Title: Firefox 153 release notes for developers (Nightly)

• https://bugzil.la/1751346 (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2026-05-29 17:18:24)

[rebloor]

@Rob--W looks good to me

[rebloor]

@Rob--W This one has me foxed. The changed file view shows the incorrect macro specification. However, when I try to edit the file to fix it, it shows as correct. When I try to update the branch and get the message “Head branch was modified. Review and try the merge again.”

[Rob--W]

@Rob--W This one has me foxed. The changed file view shows the incorrect macro specification. However, when I try to edit the file to fix it, it shows as correct. When I try to update the branch and get the message “Head branch was modified. Review and try the merge again.”

I mistakenly used one backtick instead of a quote in an old commit, but I have fixed that up and force pushed the branch shortly after the PR was created.

[Rob--W]

Oddly, I do see that the Github view has not been updated. I'll try to push again to see if that fixes it up.

[Rob--W]

I couldn't push the changes because upstream was the same as my local branch, so I fetched upstream, rebased locally and force-pushed again. Now Github's UI appears to have the expected state.