At the very least the page numbering should by default be footer center in Firefox and Thunderbird You would only have it on the bottom left if you read from right to left eg: arabic The rational for putting it bottom left is perplexing. It's very unusual to set the default as bottom left as it would cause an issue for what I'm presuming would be a greater majority of users who read left to right.
Bug 1731601 Comment 8 Edit History
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At the very least the page numbering should by default be footer center in Firefox and Thunderbird You would only have it on the bottom left if you read from right to left eg: arabic The rational for putting it bottom left is perplexing. It's very unusual to set the default as bottom left as it would cause an issue for what I'm presuming would be a greater majority of users who read left to right. Edit: I did locate bug 1663436 on Toolkit Printing and asked for page numbering in footer to be centralised.