[Bug 1959747]

[Seb45tian]

(In reply to Wayne Mery (:wsmwk) from comment #55)
> The automation of https://mozilla.github.io/mozregression/quickstart.html will make the job much easier

This helped, thank you! I was able to narrow it down a bit further to 
```
48:20.61 INFO: Last good revision: 036520a38d2b3d46fb31cf93f89d3545242feac5 (2021-01-27)
48:20.61 INFO: First bad revision: 0f4f1c5ca5d305dd600f759c69737e43478e6777 (2021-01-28)
```
So some commit in between 2021-01-27 and 2021-01-28 in the codebase of firefox or thunderbird is causing the issue. However *mozregression* then does not find any builds in between and stops with 

```
48:27.72 INFO: There are no build artifacts for these changesets (they are probably too old).
```
Now for the Firefox code base, that means **399** revisions  and for Thunderbird  **20**.  😮‍💨

Any suggestions how to tackle this further?

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https://bugs.launchpad.net/bugs/1959747

Title:
  [upstream] Very high CPU and slow responsiveness in Thunderbird 91-102

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