SUMMARY After registering site custom protocol handler it does not work and opens external application instead. STEPS TO REPRODUCE 1. Register a scheme handler 2. Try to use it (click on link with registered protocol) 3. Observe OBSERVED RESULT External commands is started, in case Falkon is registered to handle the registered protocol it will spawn an infinite amount of tabs. EXPECTED RESULT Redirected to the page specified in protocol handler ADDITIONAL INFORMATION After adding the protocol/scheme to the allowed list in [Preferences > Other > Custom Scheme Manager > Allowed Schemes (Add)] and restarting Falkon, it opens a single page with "about:blank#blocked" address in addressbar.