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CometBird is an Optimised Browser.
I have started using CometBird Browser recently , interestingly introduced to me by one of my students. I found the browser fast and so far no issues with that. It used Firefox libraries and engine. so all the Firefox extensions would work with Cometbird browser.
Pros: Fast Browser
You can use same firefox extensions with CometBird
Cons: Some Antivirus like Mcfee gives false alarm when installing