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The 'back' and 'forward ' functions have disappeared from the web brouser, how do I restore them?

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My PC resarted following a normal Firefox Update event. The brouser function which lets you go back one step, or forward one step had disappeared. I would like to re-instate this.

My PC resarted following a normal Firefox Update event. The brouser function which lets you go back one step, or forward one step had disappeared. I would like to re-instate this.

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