Changes since last update:
#4437 Fixes corrupted by Aspose fonts
#4444 Estimate the size of decoded streams in advance.
#4451 Makes firefox extension's l10n get() behavior similar to webL10n
#4426 Making extensions/chromium/*.js adhere to the style guide
#4434 Jbig2 optimizations
#4460 Fix coding style in external/builder/builder.js
#4465 Fix coding style in src/display
#4467 Fix coding style in /test
#4468 Fix coding style in make.js
#4454 Fix gaia css lint errors.
#4463 Fix copy-paste typo
#4473 Prevent infinite loop in CFFParser_parseHeader
#4477 Fixes HiDPI icons of the secondary toolbar for Chrome
#4440 refactor src/core/pdf_manager.js: rename pdfModel to pdfDocument
#4470 CMaps binary packing
#4447 Allocate fewer objects
#4464 Fixes pages without Resources in their dictionary
#4481 refactor src/core/pdf_manager.js: rename pdfModel to pdfDocument
#4488 Sync pt-BR translations with l10n-mozilla-aurora
#4474 Introduce paintSolidColorImageMask command to handle 1x1 solid image
#4453 Add a cache for glyphs
#4478 Use a vanilla array for fnArray
#4452 Making src/core/{image,obj,parser}.js adhere to the style guide
#4493 Fixes ignoring of the escaped CR LF
#4497 jpgjs performance improvements
#4503 Fix coding style in src/core/fonts.js
#4508 Fix coding style in extensions/firefox
#4507 Fix coding style in src/core
#4505 Making src/core/evaluator.js adhere to the style guide
#4509 Update lint config to enforce braces for single line statements
#4501 [Firefox] Lazy load network.js in PdfStreamConverter.js
#4517 Fixes for small colour variations in tests
#4511 Fix for #3181: jbig2 encoding for number of instances greater than 1
#4518 [Firefox] Stop importing default_preferences.js as a module and include it instead
#4466 Faster 1 bpp image drawing
#4504 Import l10n files from mozilla-aurora
#4525 [Firefox] Only load 'PdfStreamConverter' and 'PdfRedirector' when PDF.js is enabled
#4527 Partially reverts #3641
#4519 Cleaning up the viewer and pdfbug; fixes bugs in Stepper
#4515 Replaces test.py with test.js
#4529 Fix error message typo
#4521 Assign non-zero width/height to all rectangles (issue 4260)
#4541 Cools down Chrome/Windows during testing
#4543 Fixes lint for windows; adds test/font/fontutils.js
#4542 Fix typo/unused argument in fontloader.js->spliceString()