RIO DE JANEIRO, Nov 30 (Reuters) - Shareholders of Brazilian state-run oil firm Petrobras approved on Thursday a change to its internal bylaws to remove restrictions on the appointment of top-tier executives.

The move could clear the way for the appointment of politicians to join the firm's top management.

Shareholders also approved the creation of a capital reserve. (Reporting by Marta Nogueira; Editing by Kylie Madry)