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You can use "Ctrl+Page Up" or "Shift+Ctrl+Tab" to go to the Previous Tab and "Ctrl+Page Down" or "Ctrl+Tab" to go to the Next tab.
You can use Ctrl + number 1 to 8 to go to the first 8 tabs and Ctrl + 9 to go to the last tab.
See Keyboard shortcuts - Perform common Firefox tasks quickly