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.
2. StepRestart Firefox
3. Step Click on File and click on Open Multiple File Locations
4. Step Enter multiple URL’s into the field:
5. Step Change the delay in seconds to something above 7 (a good value if you don’t want to crash Firefox)