+++ This bug was initially created as a clone of Bug #1614330 +++

Changes since last update:
#11582 [api-minor] Ensure that the Array.prototype doesn't contain any enumerable properties
#11586 [TextLayer] Immediately set the padding, rather than checking if it's empty, in expandTextDivs
#11593 Remove LoopbackPort.postMessage special-case for polyfilled TypedArrays
#11596 Re-factor how Metadata class instances store its data internally
#11598 Add polyfills to support iteration of Map and Set
#11603 Enable the no-buffer-constructor ESLint rule
#11604 Enable the unicorn/prefer-starts-ends-with ESLint plugin rule
#11602 Move validation of chromium/preferences_schema.json to its own gulp task
#11605 Update gulp lint to support passing of the --fix argument on the command line
#11616 Update the PDF.js web page to link to both versions of the demo viewer (PR 11241 follow-up)
#11607 Add a PDFViewerApplication.initializedPromise property to allow (easier) tracking of when the default viewer has been initialized

https://hg.mozilla.org/mozilla-central/rev/cced12977188