How to enable file access and incognito mode for FireShot.
Introduction: this short how-to will show how to permit FireShot capturing the files loaded from disk, (not from WWW). Additionally, you can allow FireShot in the incognito mode (if you would like to).
Step 1: Open the Extensions dialog:
Step 2: Locate FireShot and click the "Details" button:
Step 3: Enable desired options: