__gwt_HostedModePlugin is not defined,,Line 231 // Development Mode requires the GWT Developer Plugin

Eh... this just started happening to me, and I am unable to use dev mode. :(

Mozilla Firefox for Linux Mint 25.0.1

about:support shows:

Google Web Toolkit Developer Plugin for Firefox 1.25 true
gwt-dev-plugin@google.com

Just did a "FireFox" reset and... no change in behavior


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