Combine if/else block with switch for getOperatorList.
[CRX] Reload extension tab after session restore
[PDFHistory] Fix "Warning: Unhandled rejection: [Exception... "The operation is insecure."" when opening local file
Merge pull request #3934 from Snuffleupagus/PDFHistory-fix-opening-local-file

[PDFHistory] Fix "Warning: Unhandled rejection: [Exception... "The operation is insecure."" when opening local file
Merge pull request #3952 from Rob--W/crx/load-after-session-restore

[CRX] Reload extension tab after session restore
Merge pull request #3940 from brendandahl/operator-cleanup

Combine if/else block with switch for getOperatorList.
Add shortcut for goto page
Merge branch 'maxsong1002/shortcutkeytonavigate'
Adds CONTRIBUTING.md for issue reporting "hint"
Fixes for CONTRIBUTING.md