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Ubuntu adding Firefox hot key

I am a keyboard guy when it comes to launch applications. On windows I was using hotkeyplus for it but my VM crashed and as we use Ubuntu for development I installed it as a host but I missed my hotkeys so the way to add hotkey for firefox is

1) Go to System->Preferences->KeyBoard  Shortcuts and click Add
2) fill details as shown below


3) Add shortcut key as shown below






 

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