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Problems inspecting firefox for android tab. Error cannot connect to the debug target. TypeError: this topWindow is null

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desbest
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I'm having problems using firefox to inspect a tab in firefox for android. I get this error when I try to inspect a tab in about:debugging

Error cannot connect to the debug target. TypeError: this topWindow is null

How can this be fixed?

I'm having problems using firefox to inspect a tab in firefox for android. I get this error when I try to inspect a tab in about:debugging Error cannot connect to the debug target. TypeError: this topWindow is null How can this be fixed?