OpenUrls is a free web tool allows you to open multiple URLs at the same time.
It works by opening a new tab in your web browser for each URL you have typed in the following textarea. These urls will be openned every 20 seconds. This interval will make the openning url naturally and keep your browser from freeze.
All major web browsers are supported, including Edge, Internet Explorer, Firefox, Chrome, Opera and CocCoc.
This support unlimited urls but if you open too many multiple links at the same time, your browser may freeze for a few seconds.
You need to allow the popup for working.