I don't read it the way you say. The more restrictive terms are for use of services. If you use firefox, you have to agree not to use the Mozilla services for the prohibited categories, but there are many uses of the browser that are not using Mozilla services.
If you accessed graphic content using the browser, you are not violating the terms unless you put that content up on a mozilla service somewhere. The obvious issue would be some type of bookmark sync. If you bookmarked a graphic url you might violate the terms when it syncs to mozilla, but even then it would be hard to argue that you are granting access to your future self, so unless you used a bookmark sharing service provided by mozilla, I would say its a gray area. So disable bookmark sync. I typically disable all external services in my browser so this would not be relevant.
But my point is that even though you have to agree to the use policy when downloading the browser, it doesn't mean it governs all use of the browser.
If you accessed graphic content using the browser, you are not violating the terms unless you put that content up on a mozilla service somewhere. The obvious issue would be some type of bookmark sync. If you bookmarked a graphic url you might violate the terms when it syncs to mozilla, but even then it would be hard to argue that you are granting access to your future self, so unless you used a bookmark sharing service provided by mozilla, I would say its a gray area. So disable bookmark sync. I typically disable all external services in my browser so this would not be relevant.
But my point is that even though you have to agree to the use policy when downloading the browser, it doesn't mean it governs all use of the browser.
IANAL