Since Firefox has tabbed browsing you can set multiple homepages so that each time you open the browser your desired pages will load without you typing the URLs or looking for them in the Bookmarks folder.
All needs to be done is to open the pages you want to set as homepages, then navigate to Tools | Options… and click on the Main tab.
Here click the Use current pages button. This action will automatically set multiple homepages separated by the | character. Another thing is to make sure that you have selected the option Show my home page under the When Firefox starts section.
Click OK and next time you open Firefox your desired pages will load automatically.
In case you want to hand-enter the URLs go to the Main tab as showed and in the Home page section type the URLs separated by a vertical line (|). Click OK and you are once again ready to have multiple homepages opened.
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