+++ This bug was initially created as a clone of Bug #1489996 +++ Changes since last update: #10060 Ensure that `PDFFindController._requestMatchesCount` won't return broken data when searching starts (PR 10052 follow-up) #10061 Implement unit tests for the `isSameOrigin` and `createValidAbsoluteUrl` utility functions and use the `const` keyword for constants in `src/shared/util.js` #10063 Slightly improve the `isSourcePDF` parameter handling in `JpegImage` (PR 10031 follow-up) #10070 Attempt to support plural forms in the matches counter of the findbar (issue 10067)

Pushed by ryanvm@gmail.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/5f9d6d1fa6cc Update pdf.js to version 2.0.854. r=bdahl