Run web-ext with Firefox DE

web-ext is a command line tool designed to speed up various parts of the browser extension development process.

When I try web-ext run -t firefox-desktop, I got the following error:

Running web extension from /home/aloisdg/Source/markdin/source

Error: not found: firefox
    at F (/usr/lib/node_modules/web-ext/node_modules/fx-runner/node_modules/which/which.js:63:19)
    at E (/usr/lib/node_modules/web-ext/node_modules/fx-runner/node_modules/which/which.js:72:29)
    at /usr/lib/node_modules/web-ext/node_modules/fx-runner/node_modules/which/which.js:81:16
    at /usr/lib/node_modules/web-ext/node_modules/fx-runner/node_modules/isexe/index.js:44:5
    at /usr/lib/node_modules/web-ext/node_modules/fx-runner/node_modules/isexe/access.js:8:5
    at FSReqCallback.oncomplete (node:fs:188:23)

This error says that web-ext can't find Firefox.

To run your extension with a version of Firefox Desktop other than the default, like the Firefox Developer Edition, use the --firefox option to specify a full path to the binary file.

First let's find the path to our binary. Since we are using GNU/Linux, it is really easy:

which firefox-developer-edition

And the path found is /usr/bin/firefox-developer-edition.

Now we can run

web-ext run --firefox="/usr/bin/firefox-developer-edition"

And voilà.

Also published on unix.stackexchange.com

source: Using web-ext, which

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Tags: extension, browser, firefox, linux

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