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Theme Font & Size Changer Thunderbird Mac stopped working Jan 5, 2018?

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Hello. Theme Font & Size Changer have been working with Thunderbird for Mac for a year. Stopped working Jan 5, 2018. Anybody else? I uninstalled and re-installed 3 times. Cannot find the "button" or function anywhere within Thunderbird. Thanks.

Hello. Theme Font & Size Changer have been working with Thunderbird for Mac for a year. Stopped working Jan 5, 2018. Anybody else? I uninstalled and re-installed 3 times. Cannot find the "button" or function anywhere within Thunderbird. Thanks.

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