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Facebook Container is a Firefox add-on from Mozilla. It keeps Facebook and Instagram apart from the other websites you visit, so their sign-in windows do not work on other sites. If you use it, you cannot connect your Instagram or Facebook account to a SnapWidget widget until you allow snapwidget.com.
1

Go to SnapWidget

In Firefox, go to snapwidget.com and log in.
2

Open Facebook Container

Click the Facebook Container icon in the toolbar. The icon looks like a fence.
3

Allow the site

Click Allow Site in Facebook Container. In Allow Facebook Tracking on this Site?, click Allow.
4

Connect your account

Reload the page if Firefox does not reload it for you. Open your widget and click Connect (or Reconnect) next to Username.
To remove snapwidget.com later, click the fence icon, click Sites Allowed in Facebook Container, and remove the site from the list. Need help connecting your widget? See Nothing happens when I click the username field.