Update with features from original Firefox extension

[Mr. Lance E Sloan «UMich»]

Many issues mentioned in this repository do not exist in the original Firefox version of JSONView. They've either been fixed already or were never a problem for that version. The FF version also has several additional features that this one does not.

Please update this repository and the extension in the Chrome Web Store to include the fixes and features from the Firefox extension.

Thank you!

[rcn46]

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#90