issues with firefox 45.0 beta slow on youtube

Added experimental feature to enable aggressive limits on the length of lines that are formatted for sources ( Fixed dynamically setting the width of tables with fixed layout and auto width ( Improved serialization of mask and background properties ( Made -webkit-image-set() an alias of image-set() ( Made margin-trim trim collapsed margins at block-start and block-end sides ( Fixed String#toWellFormed to return stringified value ( Disabled import-assertion based on TC39’s stage-2 downgrade ( Disabled wasm tail-calls because of some issues ( Made JavaScript to Wasm function calls faster ( Optimized parseInt(number) case ( Optimized RegExp performance by enhancing Boyer-Moore search ( Optimized String constructor calls ( Fixed the initial last reported size of ResizeObservation ( Fixed content truncation when text-overflow is ellipsis ( Fixed table cells, rows, sections or column (groups) to support margins ( Fixed the margin for summary on details for right-to-left mode ( Fixed inline text boxes containing Zero Width Joiner, Zero Width Non-Joiner, or Zero Width No-Break Space characters to not use simplified text measuring ( Animations.

Added showing grid and flex overlays when in element selection and highlighting elements ( Prevented showing ::backdrop rules for elements without a backdrop ( Sources tab.Safari Technology Preview Release Notes Release 164 Web Inspector

Issues with firefox 45.0 beta slow on youtube