Many of the Google APIs used by Chromium code are specific to Google Chrome and not intended for use in derived products. In the API Console you may be able to purchase additional quota for some of the APIs listed above. For APIs that do not have a "Pricing" link, additional quota is not available for purchase.
During a recent audit, we discovered that some third-party Chromium based browsers were able to integrate Google features, such as Chrome sync and Click to Call, that are only intended for Google’s use.
Chrome Google API提供登入Google帳號、同步等功能。但Google認定，這個API key不能直接寫在Code內，也並非供最終使用者使用。但Google自己早已寫進Chromium的code。
過去各Linux發行版本維護的Chromium，都在啟用這個API Key的狀態下編譯，因此有等同Chrome的功能。但Google決定從今年起，不再認同這種作法。
所以將來要有Sync之類的服務，必須要用Google自己的Chrome？
你可以考慮升級電腦是不是YT沒有針對Firefox最佳化？