Fix code style in extensions/firefox/content/PdfJs.jsm
Fix code style in extensions/firefox/content/PdfjsChromeUtils.jsm
Fix code style in extensions/firefox/content/PdfjsContentUtils.jsm
Fix code style in extensions/firefox/content/PdfJs-stub.jsm
Fix code style in extensions/firefox/content/PdfJsTelemetry.jsm
Fix code style in extensions/firefox/content/PdfJsTelemetry-addon.jsm
Fix code style in extensions/firefox/content/PdfStreamConverter.jsm
Update |node make lint| to also cover the Firefox specific *.jsm files
Merge pull request #5406 from Snuffleupagus/lint-firefox-jsm

[Firefox] Enable linting of *.jsm files and update the code style in extensions/firefox/content