Can you please make tabs open in order when right clicking a link and using "Open in New Tab"?
Sometimes they open in order, but not always. I usually start on a home page and click "Open in New Tab" on multiple links, then work my way through the tabs I've opened. In Chrome, they always opened in order. Not in Firefox. This has been my biggest annoyance since switching browsers.
See also these prefs on the about:config page.
You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.