Simplify the Firefox Shield Icon and Restore Clear ETP Status

[tonialb]

1. Simplify the Shield icon.
   I don't like the current Firefox Shield with the fox design. I think a simpler, cleaner shield would better match Firefox's interface and improve readability.
2. Make the ETP icon more visually informative.
   When Enhanced Tracking Protection (ETP) blocks trackers, fingerprinting, cryptominers, or other harmful content on a website, the shield icon should change color or appearance to make it immediately obvious that protection is actively working. I remember Firefox used to provide more noticeable visual feedback, and I found that more intuitive!

These changes would make the interface cleaner while also making Firefox's privacy protections more visible and easier to understand.

[Jon]

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