Comment 2 for bug 1589792

Please note: The diff introduces a change in a translatable string (replaces hard-coded 'px' unit identifier with a variable). If this part of the proposed changes blocks inclusion in upcoming 0.92 due to the string freeze already in-place, a different solution could be to converted the reported sizes to CSS pixels - though within the context of the extension I'm not sure it would match user expectations better wrt lengths and area of the reported properties. Otherwise, please target to 0.93 (and consider mentioning the current state of the extension under 'Known issues' in the release notes).