After the latest update of the minimum supported Firefox version, the development addon is no longer being signed. Hence this patch attempts to address that, by pinning the `minVersion` to a specific version number instead. *Please note:* The version numbers were taken from https://addons.mozilla.org/en-US/firefox/pages/appversions/, so it ought to have worked.
This is the PDF.js project output, https://github.com/mozilla/pdf.js Current extension version is: PDFJSSCRIPT_VERSION Taken from upstream commit: PDFJSSCRIPT_COMMIT