Weh Inspector

Weh Inspector

Trace Remote Procedure Calls on Weh-2 addons

Weh Inspector promo image
What is Weh Inspector?

Weh Inspector is a Firefox add-on that allows you to trace remote procedure calls on Weh-2 add-ons developed with the Weh2 toolkit. With WehInspector, you can debug and inspect WebExtensions add-ons, read and write add-on preferences, and read add-on storage data.

Stats date:
By: mig
Users: 56
Rating: 4.17 (6)
Version: 2.1 (Last updated: 2018-04-27)
Creation date: 2017-12-03
Weekly download count: 2
Firefox on Android: No
Manifest version: 2
  • tabs
  • contextMenus
  • management
  • storage
Size: 305.63K
URLs: Website
Risk impact: Moderate risk impact
Risk likelihood: Low risk likelihood

Other platforms

Not available on Chrome
Not available on Edge

WehInspector is a tool add-on to help debugging WebExtensions add-ons developed with the Weh2 toolkit (available under Mozilla Public License 2.0 from https://github.com/mi-g/weh.

It provides the following capabilities:

  • Trace Weh Remote Procedure Calls between the add-on background and other components: local add-on content, web pages injected content, web workers, native applications, ...
  • Read and write add-on preferences
  • Read add-on storage data (both HTML5 and WebExtensions storage API)
The WehInspector add-on, along with its source code, is part of the Weh2 project and you can build and install it from there, but for convenience it is also available publicly for direct installation.

WehInspector user interface runs in a single tab. To create or select that tab, right click in a page content and pick "Weh Inspector" from the context menu. In the dropdown menu at the top left, select the Weh2-based addon to debug (if you have only one installed, it will be selected automatically).

There is one thing it is important to understand when inspecting RPC calls: WehInspector has a settings parameter, "Messages display mode", that can take one of 3 values: "synchronous on call", "synchronous on reply", "asynchronous". Let's take a common situation where the background calls a function A from a content component, this function calls B from the background and returns. This will be 4 messages: call A, call B, reply B, reply A. If the "Messages display mode" is set to "synchronous on reply" (the default), you will see 2 entries in the WehInspector interface: the call to B, then the call to A. If set to "synchronous on call": the call to A, then the call to B, and if "asynchronous", you will see 4 entries corresponding to the messages explained earlier.

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Risk impact

Weh Inspector may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.

Risk likelihood

Weh Inspector has earned a fairly good reputation and likely can be trusted.

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