Multiple URL Opener is a free extension that takes a list of URLs in plain text format and opens all URLs simultaneously.
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https://sketch-pad.xyz/
https://www.multipleurlopener.live/
https://twitter.com/murlopener
https://www.diigo.com/profile/murlopener
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https://www.scoop.it/topic/v-by-murlopener-gmail-com
https://www.quora.com/profile/Multiple-URL-Opener
https://www.pearltrees.com/murlopener#item435308165
https://www.blogger.com/u/1/profile/08289882963434164359
https://medium.com/@murlopener/multiple-url-opener-b95cfc00b5ec