two tabs in firefox

I want to open two tabs with same website in firefox but when i want to do it, the second tab automatically refers to the previous one. how can I fix this problem ?
Answer #1
If you’ve bookmarked it, go to bookmarks and right click on the bookmark and select open in new tab.
Answer #2
Middle click on mouse or ctrl + left click.
Answer #3
CTRL+SHIFT+P
Open a 2 moxilla and you can work how you like in each other

Answer #4
thanks. solved.