As a User I want to long press on any link in web content to open it in a new private tab

[st3fan]

Tasks

• Create component for showing browser context menu android-components#1272 - Create component for showing browser context menu
• Create feature-contextmenu component android-components#1386 - Create feature component for context menu
• Integrate feature-contextmenu component #203 - Integrate feature component
• Show snackbar when tab was opened in the background #218 - Show Snackbar

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Fennec currently shows a menu with common actions: