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JavaScript Debugger Requires Restart

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

Rated 4 out of 5 stars (52)
882 users

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Execute JS Requires Restart

Execute JS is a enhanced JavaScript-Console, where you can comfortably enter and execute arbitrary JavaScript-Code and modify functions...

Rated 5 out of 5 stars (15)
0 users

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Tiny JavaScript Debugger

TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavaScript.

Rated 5 out of 5 stars (8)
54 users

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Developer Assistant Requires Restart

A suite of tools for developers.

Rated 4 out of 5 stars (46)
0 users

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JavaScript Object Examiner Requires Restart

Display JavaScript object methods and properties for any available scope.

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XPCOMViewer Requires Restart

XPCOMViewer is tiny tool for exploring XPCOM components.

Rated 4 out of 5 stars (6)
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JSON Inspector

Inspect JSON object from a URL or entered data.
Requires either DOM Inspector or DOM Inspector Plus! [dm] extension.

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