isolated "Work offline"

[Mypgr]

I suggest , add this feature , I be able set work offline for only tab or a window, and other windows and tabs be online , I am programmer and some time I need I test my code in offline mode to prevent excessive internet bandwidth usage , but now , when I checked "Work offline" , all Firefox windows and tabs go offline . this not different with I disable my whole network, I think is better to we have isolated tab features.

Thank you

[Jon]

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