Right-click on the browser tab and choose "Pin Tab." Your tab will move to a smaller tab on the left side of the tab bar. No matter how many tabs you have open, pinned tabs will always be visible on the left. They'll also open automatically when your browser starts. To unpin a tab, just right-click on it and choose "Unpin Tab."
Also work's in chromium based browsers
They'll also open automatically when your browser starts.
not if you run your browsers in Private/Incognito Mode, so that feature doesn't work for me.