Automatically resolve platform settings differences when importing from backup

[WesleyBranton]

Different platforms have different functionality available. For example, Firefox does not allow custom widths like Chromium does.

In this case, there may be some issues when importing backups from one platform to another. There needs to be a check in place that will attempt to convert settings between platforms. For example, custom widths on Chromium can be converted to platform default or thin based on size when imported into Firefox.

Additionally, unnecessary settings should not be saved to the Storage API when importing.