It Claims to be an alternative to HTTPWatch but it missing a key feature Rated 4 out of 5 stars

AS HTTPWatch is no longer supported in the newest versions of Firefox my hopes were high that this add-on would fix my automation issues.

HTTPfox works well as a user controlled add-on
with similar feature to HTTPWatch,
Start,Stop, Clear and Filter options it does the job well.

As for its ability to interface with external programming languages such as ruby, C#, It Has none.

There is no support to export data.
There is no ability to start, stop, clear or set filters programmatically