Firefox toolbar icon resizes on rollover
I have the latest version of Firefox, and am using the Zotero 4.0.28.10 plugin. I have the Zotero icons on the toolbar. Normally the 'Z' icon is separated from the 'page' icon by a vertical bar. When I mouse over the icons, the vertical bar disappears, which causes the entire toolbar to change spacing. Is this expected behavior?
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However, on XUbuntu with Firefox 43 it looks for me wrong in the other direction, see https://gist.github.com/zuphilip/43659689290322adbc2e .