Sergei Konkov—TASS via Getty Images
By Lisa Marie Segarra
July 25, 2018

It might seem surprising that an executive from Mozilla said on Twitter that YouTube runs five times slower on Firefox than it does on Google Chrome. But the news also came with an explanation and a fix.

Chris Peterson, technical program manager at Mozilla, said Wednesday the issue is due to YouTube’s API, or application programming interface, which uses a deprecated shadow DOM API. This makes YouTube run slower on other browsers like Firefox and Microsoft Edge, but not Google Chrome. The API is part of a YouTube redesign from about a year ago, but the problem persists. It also brings up questions about Google’s ability to sway users to use more of its products.

Peterson tweeted out links to an add-ons for Firefox and Edge that would restore YouTube to its interface before the change that slowed it down.

Fortune reached out to Google for confirmation and comment, but did not receive an immediate reply.


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