Fortunately it isn’t a big issue to modify the tab behavior yourself. Just type about:config in your address bar and press enter. you’ll get a warning from firefox to be careful on the next page.
You have now entered in the configuration panel of firefox which lets you modify more than the default options.

Here are some modification options to optimize the tab behavior to your likings, each op the parameters can be modified by double-clicking on it. Modified settings can be recognised as they are in a bold font.

• browser.allTabs.previews: if true your browser will show a preview of each tab if you click on the allTabs button on the far right end of your tab bar. If false a list of open tabs will be shown.
• browser.allTabs.previews: if true your browser will show a preview of the pages as you use ctrl+tab to navigate between your tabs. If false you can just cycle through your open tabs.
• browser.tabs.insertRelatedAfterCurrent: if true firefox will open every new tab next to the current working tab on your tab bar. If false firefox will open every new tab at the far end of your tab bar.

These are just some options I modified to optimize my personal behavior but you can use this about:config page to modify more settings but be aware of what settings you modify.