Bulk URL Opener Extension just lets you open multiple URLs at once (in new tabs or windows).
Usage: Enter each URL in new line (you can paste the list if you prefer) and click the "Open All" button. The app will the open all the pages in separate tabs or windows (depending on your settings).
The difference between this extension and other similar extensions is that if an URL doesn't include scheme, it will default to HTTP. In other words, you may skip the protocol part for "http://" sites and enter only the meaningful part. For example — if you type "domain.com" it will be automatically translated to "http://domain.com". All similar extensions that I tested required fully qualified URL which wasn't very convenient for me and that's actually the main reason I made this tool.