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In either headless and non-headless mode, I'm trying to load a Firefox Dev Edition profile with geckodriver. Firefox opens up fine, and in the extensions list I do see the extensions I use with that profile normally. However, none of the extensions are actually working, and if I go to 'debug extensions' and inspect each one, I see Error: Protocol Error (unknownError): Extension not found: <extension name>.

Specifically, I'm using Python with Selenium, with FirefoxProfile("<profilepath>").

Geckodriver.log does show JavaScript error: resource://gre/modules/XULStore.jsm, line 66: Error: Can't find profile directory., but the profile directory is correct and it is loading (since it shows the proper plugins listed in Firefox).

Max
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It seems that when you launch FF with existing profile, add-on is shown in about:addons, but nothing works. I think the main reason is that FF makes a copy of the profile in temp windows folder, and some path information is lost somewhere down the way.

So my solution was to load extension as temporary.

How to use new geckodriver endpoints?

You launch webdriver from derived class and then pass address of your .xpi. No need to search for server address and sessionId, it's magically there.

Hippopotamus
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