LoadMagic.ai HAR Transaction Marker by David Campbell
Firefox sidebar utility for bracketing HAR recordings with start/end transaction markers and DCAI headers.
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About this extension
Free addon to save transaction markers to JSON file which can later be used with a HAR file to set wrappers around desired transactions in a user flow.
Anyone who wants to capture timings as they perform actions in a browser could find this useful.
Usage:
1. type transaction name
2. hit return
3. record user flow (HAR file via F12 dev mode)
4. hit end to mark end of transaction
5. repeat as required
6. save json file via "Download marker timeline" button
Anyone who wants to capture timings as they perform actions in a browser could find this useful.
Usage:
1. type transaction name
2. hit return
3. record user flow (HAR file via F12 dev mode)
4. hit end to mark end of transaction
5. repeat as required
6. save json file via "Download marker timeline" button
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Permissions and data
Required permissions:
- Access browser tabs
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 0.1.0
- Size
- 437.21 KB
- Last updated
- 14 days ago (Jan 15, 2026)
- Related Categories
- License
- MIT License
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Add to collection
However, this could be used by anyone who needs to mark timestamps while performing browser actions.