Bug 1492100 Comment 5 Edit History

Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.

If I whitelist these resources, the comments show:
```
https://connect.facebook.net/zh_TW/sdk.js
https://www.facebook.com/tr/
https://www.facebook.com/v2.8/plugins/comments.php
https://www.facebook.com/v2.8/plugins/like_box.php
https://www.facebook.com/rsrc.php/
https://www.facebook.com/plugins/comments.php
https://www.facebook.com/plugins/feedback.php
https://scontent-yyz1-1.xx.fbcdn.net/v/
```

If `sdk.js` is blocked the none of them load. So we can shim `sdk.js` with a script which puts a placeholder on every `.fb-comment`, which the user can click to opt into allowing the real `sdk.js` to load. This was easy enough to add to a shim for allowing FB logins, as suggested in bug 1226498.
If I whitelist these resources, the comments show:
```
https://connect.facebook.net/zh_TW/sdk.js
https://www.facebook.com/tr/
https://www.facebook.com/v2.8/plugins/comments.php
https://www.facebook.com/v2.8/plugins/like_box.php
https://www.facebook.com/rsrc.php/
https://www.facebook.com/plugins/comments.php
https://www.facebook.com/plugins/feedback.php
https://scontent-yyz1-1.xx.fbcdn.net/v/
```

If `sdk.js` is blocked the none of them load. So we can shim `sdk.js` with a script which puts a placeholder on every `.fb-comment`, which the user can click to opt into allowing the real `sdk.js` and the above resources to load. This was easy enough to add to a shim for allowing FB logins, as suggested in bug 1226498.

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