Copper (Cu) CoAP user-agent (JavaScript implementation)
JavaScript CSS
Latest commit 50e0fe7 Jan 12, 2017 @mkovatsc committed on GitHub Update

Issue: No Copper since FF 50

Since version 50, Firefox simply forwards all schemes to the default handler, that is, search. Also FireFTP and other extensions show this problem. Even non-protocol related add-ons show strange behavior in my browser (e.g., All-in-One Sidebar).

Quick fix: Set browser.tabs.remote.autostart.2 to false using about:config

Info: Copper for Google Chrome

Copper is now also available for the Chrome browser: Copper (Cu4Cr)

Copper (Cu) CoAP user-agent

Implements RFC7252

A Firefox add-on to browse the Internet of Things

How to integrate the Copper sources into Firefox:

  1. Get the sources from Github: clone git://
  2. Add a text file named to your extension directory of your profile:
  • Windows: C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Profiles\xxxxxxxx.default\extensions\
  • Linux: ~/.mozilla/firefox/xxxxxxxx.default/extensions/
  • MacOS: ~/Library/Application Support/Firefox/Profiles/xxxxxxxx.default/extensions/
  1. Write the path to the Copper sources (i.e., the directory that contains install.rdf and chrome.manifest) with (back)slash at the end to the file (e.g., D:\Projects\Git\Copper\).
  2. Since Firefox 43 you need to allow unsigned add-ons by opening about:config and setting xpinstall.signatures.required to false.
  3. Restart Firefox.
  4. Optionally use about:config with the filter "copper" to clean up old configurations.

Copper should show up in the add-ons list. You can now enter CoAP URIs (e.g., coap:// into the address bar and will have a user interface to interact with the CoAP resources on a server. The detailed log output is available through the rectangular button on the top right, next to the preferences button.

See also: