Investigate on Firefox CPU/loading issues

[gauthierpetetin]

What is this about?

Based on logs shared by this user, there are some CPU/loading issues on Firefox.

Preliminary analysis raises the following possible root causes:

• High number of connections/listeners: There are 98 MaxListenersExceededWarning entries in the logs, which suggests either many connections (e.g. many tabs open) or something adding listeners / creating streams without cleaning up.
• ExtensionStore slowness: There are several large write times (1924ms, 847ms, 6536ms, 1637ms, 716ms, and many in the 800–900ms range).
• Fetch failures (NetworkError): These may be related to loading source map.

We should investigate what can be done to solve these issues.

Scenario

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Design

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Technical Details

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Threat Modeling Framework

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Acceptance Criteria

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Stakeholder review needed before the work gets merged

• Engineering (needed in most cases)
• Design
• Product
• QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
• Security
• Legal
• Marketing
• Management (please specify)
• Other (please specify)

References

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