Bugzilla

I think TB will need to port this change over (if it lands):

`<children includes="image|box"/>`:
* https://searchfox.org/comm-central/source/mail/components/addrbook/content/abMailListDialog.xul#82
* https://searchfox.org/comm-central/source/mail/components/addrbook/content/abEditListDialog.xul#71

`<children/>`:
* https://searchfox.org/comm-central/source/editor/ui/dialogs/content/EdLinkProps.xul#46
* https://searchfox.org/comm-central/source/editor/ui/dialogs/content/EdImageProps.xul#47

For Firefox's only usage of `<children includes="..."/>`, I'm just moving out the children from the textbox and putting them as siblings.

For TB, the options are:
* Moving out the actual children and putting them as siblings like Firefox
* Using `background-image` instead of `<image src="person-icon"/>`
* Temporarily creating a new binding that extends autocomplete, and that adds back the `<children/>` in the `<content>`

I think TB will need to port this change over (if it lands):

`<children includes="image|box"/>`:
* https://searchfox.org/comm-central/source/mail/components/addrbook/content/abMailListDialog.xul#82
* https://searchfox.org/comm-central/source/mail/components/addrbook/content/abEditListDialog.xul#71

`<children/>`:
* https://searchfox.org/comm-central/source/editor/ui/dialogs/content/EdLinkProps.xul#46
* https://searchfox.org/comm-central/source/editor/ui/dialogs/content/EdImageProps.xul#47

For Firefox's only usage of `<children includes="..."/>`, I'm just moving out the children from the textbox and putting them as siblings.

For TB, some different ideas are:
* Moving out the actual children and putting them as siblings like Firefox
* Using `background-image` instead of `<image src="person-icon"/>`
* Temporarily creating a new binding that extends autocomplete, and that adds back the `<children/>` in the `<content>`