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I learned something today, and it was painful!

I am using the Mozilla FireFox Modify Headers plugin for mobile browser testing to test a very large enterprise application and the mobile screens were not functioning as expected.

I rebuilt/re-checked out/restarted for several hours.

The problem was that this plugin will only function with the headers that you configured it with WHEN the tab that you have configure it with is open.  This is the default behavior.  We can change this in the advanced options screen (which I did) to fix it to always send these headers.