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Invoking Thunderbird from mac "Dock" uses > 100% cpu with noisy fan, invoking manually doesn't. Why?

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I use Thunderbird 140.1.0esr, in Catalina 10.15.7 on a 2012 mac mini. Before 140.0esr, everything worked nicely. Since it updated to 140.0esr (I think), invoking Catalina from the Dock became a CPU hog, using over 100% cpu, (there were 2 Activity Monitor entries: Thunderbird and thunderbird, adding up to > 100%) and causing intrusive fan-noise from the mini's fan.

I thought invoking TB from the Dock was little more than running, from a Terminal: 

/Applications/Thunderbird.app/Contents/MacOS/thunderbird &

However, I tried doing that (which I called "invoking TB manually" in the subject above. To my surprise, TB's CPU consumption dropped by about 90%, and the fan shut up. As far as I can see (at least, having sent test messages between various accounts), TB seems to look and work just fine when invoked manually.

My problem is that I'm baffled as to why "Dock" Thunderbird.app is so uncivilised compared to "manual" invocation of thunderbird.

I use Thunderbird 140.1.0esr, in Catalina 10.15.7 on a 2012 mac mini. Before 140.0esr, everything worked nicely. Since it updated to 140.0esr (I think), invoking Catalina from the Dock became a CPU hog, using over 100% cpu, (there were 2 Activity Monitor entries: Thunderbird and thunderbird, adding up to > 100%) and causing intrusive fan-noise from the mini's fan. I thought invoking TB from the Dock was little more than running, from a Terminal: /Applications/Thunderbird.app/Contents/MacOS/thunderbird & However, I tried doing that (which I called "invoking TB manually" in the subject above. To my surprise, TB's CPU consumption dropped by about 90%, and the fan shut up. As far as I can see (at least, having sent test messages between various accounts), TB seems to look and work just fine when invoked manually. My problem is that I'm baffled as to why "Dock" Thunderbird.app is so uncivilised compared to "manual" invocation of thunderbird.

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