You need to open a lot of pages at once? Here’s how you can open multiple URL’s in firefox tabs, even with a delay of x seconds between each opened tab.

1. Download https://addons.mozilla.org/en-US/firefox/addon/open-multiple-locations/

2. Restart Firefox

3. Click on File and click on Open Multiple File Locations

4. Enter multiple URL’s into the field:

5. Change the delay in seconds to something above 7 (a good value if you don’t want to crash Firefox)

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  Black Ops 2
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  Halo 4
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  God of War 4
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  Crysis 3