Action Required: Old PRs need to be closed and reopened before they can merge into master.
Our Taskcluster CI system has moved to a new instance. Unfortunately this caused the name of the associated status check to change from "Taskcluster (pull_request)" to "Community-TC (pull_request)". Since a passing status is required to merge PRs, and GitHub doesn't allow specifying a set of possible statuses, this means that PRs predating the new system will have the missing status check marked as pending, and not be mergable.
To get the required CI job to run, please close and reopen the PR. We have not done this automatically to avoid saturating our CI infrastructure. Apologies for the inconvenience this change is causing, and please report any issues with the new system either on IRC or in the issue tracker.