fix for when activeTab.url is not yet defined
fix for when activeTab.url is not yet defined
benvanik/WebGL-Inspector,mcanthony/WebGL-Inspector,benvanik/WebGL-Inspector,TheKK/WebGL-Inspector,greggman/WebGL-Inspector,TheKK/WebGL-Inspector,greggman/WebGL-Inspector,cedricpinson/WebGL-Inspector,greggman/WebGL-Inspector,benvanik/WebGL-Inspector,mcanthony/WebGL-Inspector,TheKK/WebGL-Inspector,cedricpinson/WebGL-Inspector,cedricpinson/WebGL-Inspector,mcanthony/WebGL-Inspector