Selenium 2.53 or 2.48 not working in Firefox 48.0

Question

I am getting an error in Firefox 48.0 in new the update from firefox 47

Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output: 066 addons.xpi DEBUG Updating database with changes to installed add-ons

My system and browser configuration are:

Firefox 48

Selenium 2.48 also try 2.53

Window 8 64bit

I also tried the marionette driver but did not receive proper output with that.

Any ideas on how to fix this besides downgrading firefox?

Answer 1

Older versions of Selenium (like 2.5.x) do not work and won't work with Firefox 48+. The reason is that Firefox 48 changed a lot of stuff, including the fact that extensions must be signed by Mozilla to work with Firefox. To fix the Selenium issue, Mozilla took ownership of FirefoxDriver() and they a released a Marionette version for this, including a Gecko driver.

This is what you need to use to be able to execute your tests on Firefox 48+.