Version 5 release checklist

[Snuffleupagus]

The following is a, probably incomplete, list of things we should ensure are done before the release:

• Ensure that no open release-blocker Blocker for the upcoming release items exist.
• Considering its size/scope, ensure that PR [api-minor] Render high-res partial page views when falling back to CSS zoom (bug 1492303) #19128 has landed in mozilla-central and been given some time (e.g. at least a weak) in Firefox Nightly before the release.
• Update the l10n files, such that we pick up the latest editor-strings and reduce the number of Fluent warnings.
• Update the npm packages.

/cc @timvandermeij

[Snuffleupagus]

• The following is a, probably incomplete, list of a few significant new features in this release:

  • Improved JPEG 2000 decoding-support:

    • The OpenJPEG decoder was moved into a separate .wasm file, which requires setting a new wasmUrl API-option in order to use it; see PR [api-major] Add openjpeg.wasm to pdf.js (bug 1935076) #19329

    • A (much slower) JavaScript OpenJPEG fallback-decoder was added (also uses the wasmUrl API-option), for environments without WebAssembly support; see PR Provide a js fallback when the wasm version of openjpeg is failing to load (bug 1935076) #19525

  • Support for ICC profiles[1]:

    • This requires WebAssembly support, and that the wasmUrl API-option is set; see PR [api-minor] Support using ICC profiles in using qcms (bug 860023) #19564

    • Use an ICC profile to improve CMYK to RGB colour conversion, which requires setting a new iccUrl API-option in order to use it; see PR [api-minor] Use an icc profile for converting CMYK to RGB #19620

  • Improved rendering of large pages in the viewer:

    • Render the currently visible portion of pages at full resolution, once we've reached the size-limits and are falling back to CSS-zooming; see PR [api-minor] Render high-res partial page views when falling back to CSS zoom (bug 1492303) #19128

    • Limit the maximum canvas dimensions, to avoid rendering breaking and canvases being empty; see PR [api-minor] Limit the maximum canvas width/height, in addition to its total area (bug 1943094) #19604

  • Enable creation of hyperlinks, in the viewer, from text that look like URLs:

    • This is disabled by default, because of some remaining issues, but can be enabled in the viewer with the enableAutoLinking option/preference; see PR Enable automatic URL linking (bug 1019475) #19110

• The following is a, probably incomplete, list of a few potentially significant[2] changes in this release:

  • Addition of a couple of new CSS variables, that e.g. the textLayer and annotationLayer now depend upon; see PR [api-major] Apply the userUnit using CSS, to fix the text/annotation layers (bug 1947248) #19469

  • Removal of a couple of old exceptions; see PR [api-major] Replace MissingPDFException and UnexpectedResponseException with one exception #19264

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[1] Currently Lab profiles are not supported, which is tracked in bug 1717767.

[2] These are things that may require changes in third-party PDF.js implementations.

[Snuffleupagus]

There should be no more blockers remaining, and given the time since the last release it'd probably be good to create a new one sooner rather than later.
@timvandermeij Since you've handled all releases the last few years, and probably know the process the best, would you be able to take care of this?