1178263 - JS Resource loader gets "undefined" when opening in new tab sometimes

Status: RESOLVED INVALID

(Firefox :: Tabbed Browser, defect)

Description

[john.duffell]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36

Steps to reproduce:

Firefox: 38.0.5
Also nightly: 41.0a1 (2015-06-29)
1. Open our website http://www.theguardian.com/uk
2. open a story in a new tab
3. if the adverts appear, close the tab and return to step 2
4. if the adverts don't appear, you should see a console error 'n is undefined'


Actual results:

You will get a TypeError: n is undefined.
In this case, n is minified from "config" on this line:
https://github.com/guardian/frontend/blob/master/static/src/javascripts/projects/common/modules/experiments/ab.js#L114


Expected results:

The adverts and JS should have loaded, and config should have been defined.
We are using https://github.com/cujojs/curl to load our modules, but the problem only seems to affect firefox.  However it could be a race condition somehow, not necessarily a bug in firefox.

Comment 1

[john.duffell]

P.S. I have also reported it to curl and they are looking at it, so check there before looking into it here: https://github.com/cujojs/curl/issues/289

Comment 2

[u554753]

Hi John,

Can you see if this is reproducible in the newest version of Firefox? Thanks.

Comment 3

[john.duffell]

Hi Grover thanks for getting back to me, after reporting it here and to curl loader, we eventually discovered it was some of our code falling over (due to us trying to access the dom before it was ready) and curl wasn't reporting the error anywhere.  So feel free to close this one down.  John