The currently selected branch isn't shown anywhere on the source browser.
Go to the source browser, e.g., https://bitbucket.org/pypy/pypy/src
Click on one of the branches in the branches menu
Expected The source browser at the revision of that branch is shown. The selected branch name is highlighted somewhere.
Actual * The source browser at the revision of that branch is shown.
Perhaps we can show the branch name in the branches menu itself, near the ">>".