Browser: FireFox ESR 38.2.0 PL, 32-bit, Windows 7 64 bit, with clean browser cache.
If AdBlock is active: there are no editing tools nor feedback button, feedback button on main page is removed too.
Disabling Adblock and reloading page helps to resolve this issue.
After that I can re-enable AdBlock and everything is fine
Screenshot and AdBlock filters settings: attached.