Bug 1600155 R[Core:CSS Parsing and Computation]Make @import rules less weird.
Bug 1600376 R[Core:CSS Parsing and Computation]Remove useless namespace qualifications in layout/style.
Bug 1598775 R[Core:DOM: Navigation]Ensure postMessage related optimizations during page load work also in Fission
Bug 1599467 R[Core:DOM: Navigation]Make XHR and Fetch to use deprioritized loading while the top level page is loading in Fission
Bug 1568717 R[Core:DOM: Networking]Intermittent TEST-UNEXPECTED-PASS | /fetch/sec-metadata/redirect/redirect-https-downgrade.tentative.sub.html | Https downgrade prefetch => No headers - expected FAIL
Bug 1600320 R[Core:General]ThreadSanitizer: data race [@ style::gecko_bindings::sugar::ns_t_array::...::set_len] vs. [@ Length] racing on global sEmptyTArrayHeader
Bug 1555376 R[Core:Graphics: WebRender]Glyphs are clipped at various zooms and scales
Bug 1600421 R[Firefox:General]Bookmark Panel: Style attribute should be a CSS rule, not just a value
Bug 1600454 N[Firefox Build System:General]Fix the build with various non-default configurations.
Bug 1600361 R[Firefox Build System:Generated Documentation]Move the SA doc in tree
Bug 1599749 R[Firefox Build System:Lint and Formatting]Split the coding style documentation
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Changes to 12 bugs - 11 fixed.