A guy who worked for Blogged.com, occasionally needed to “open large numbers of web addresses from a spreadsheet or a text file”, so that he or she created a website which let people open a whole list of urls at the same time.
The website is URLOpener, on which you just need to input the URLs (one url per line), and then you can open them all at the same time or open them one by one.
For better performance, the webmaster suggests you to open all the URLs in new tabs, and tells you how to do that.
The web app URLOpener should be useful for those who have a list of URLs to be opened at the same time, if you do not have such a list, it won’t be so useful, since you can’t save your URs, and you have to input the URLs into it one by one.
Although there is a Firefox Add-on called Copy Links, which lets you copy all links on a web page or just in a selected area of the page, it doesn’t work well if you want to open those 20 web pages of Blogged.com, since you will get multiple same links of Blogged.com. So, do you have a list of urls to open at the same time?