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Using Firefox with my fiber optic internet connection cuts my speed test results from 1 gig down to 510 mps. How to fix?

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Getting 1 gig test results using other browsers. Refreshed Firefox and performed all the recommended tasks. Same result each time

Getting 1 gig test results using other browsers. Refreshed Firefox and performed all the recommended tasks. Same result each time
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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:73.0) Gecko/20100101 Firefox/73.0

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