Bug 1815080 Comment 4 Edit History

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Aha, this wasn't in chaos mode.  This was just during `Running test verification step "Running tests in a loop 10 times"...`

Log snippet:
```
[task 2023-02-04T21:11:24.772Z] 21:11:24     INFO - :::
[task 2023-02-04T21:11:24.780Z] 21:11:24     INFO - ::: Running test verification step "Running tests in a loop 10 times"...
[task 2023-02-04T21:11:24.781Z] 21:11:24     INFO - :::
[...]
[task 2023-02-04T21:12:45.516Z] 21:12:45     INFO - ## Slow tests ##
[task 2023-02-04T21:12:45.516Z] 21:12:45     INFO - 
[task 2023-02-04T21:12:45.517Z] 21:12:45     INFO - |                           Test                          | Result | Longest duration (ms) | Timeout (ms) |
[task 2023-02-04T21:12:45.518Z] 21:12:45     INFO - |---------------------------------------------------------|--------|-----------------------|--------------|
[task 2023-02-04T21:12:45.518Z] 21:12:45     INFO - | `/css/css-images/image-set/image-set-computed.sub.html` | `OK`   | `8679`                | `10000`      |
[task 2023-02-04T21:12:45.518Z] 21:12:45     INFO - 
[task 2023-02-04T21:12:45.519Z] 21:12:45     INFO - ::: Running tests in a loop 10 times : FAIL
[task 2023-02-04T21:12:45.519Z] 21:12:45     INFO - :::
[task 2023-02-04T21:12:45.519Z] 21:12:45    ERROR - ::: Test verification FAIL
```

This wasn't an outlier; many of the test iterations were 6+ seconds long:


So this might just be a slow test. Needs investigation to find out why & if it's also slow in other browsers as well.  If the slowness isn't
Aha, this wasn't in chaos mode.  This was just during `Running test verification step "Running tests in a loop 10 times"...`

Log snippet:
```
[task 2023-02-04T21:11:24.772Z] 21:11:24     INFO - :::
[task 2023-02-04T21:11:24.780Z] 21:11:24     INFO - ::: Running test verification step "Running tests in a loop 10 times"...
[task 2023-02-04T21:11:24.781Z] 21:11:24     INFO - :::
[...]
[task 2023-02-04T21:12:45.516Z] 21:12:45     INFO - ## Slow tests ##
[task 2023-02-04T21:12:45.516Z] 21:12:45     INFO - 
[task 2023-02-04T21:12:45.517Z] 21:12:45     INFO - |                           Test                          | Result | Longest duration (ms) | Timeout (ms) |
[task 2023-02-04T21:12:45.518Z] 21:12:45     INFO - |---------------------------------------------------------|--------|-----------------------|--------------|
[task 2023-02-04T21:12:45.518Z] 21:12:45     INFO - | `/css/css-images/image-set/image-set-computed.sub.html` | `OK`   | `8679`                | `10000`      |
[task 2023-02-04T21:12:45.518Z] 21:12:45     INFO - 
[task 2023-02-04T21:12:45.519Z] 21:12:45     INFO - ::: Running tests in a loop 10 times : FAIL
[task 2023-02-04T21:12:45.519Z] 21:12:45     INFO - :::
[task 2023-02-04T21:12:45.519Z] 21:12:45    ERROR - ::: Test verification FAIL
```

This wasn't an outlier; many of the test iterations were 6+ seconds long:

So this might just be a slow test. Needs investigation to find out why & if it's also slow in other browsers as well.  If the slowness isn't unique to Firefox, we can just annotate the test as needing a longer timeout.

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