No Execution in New Tab on Chrome ("No tab with id")

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Race condition: Crossrider extensions do not run on cached sites, in new tabs on Chrome.

- Tested in OS X Mountain Lion & Windows 8.
- Affects ALL Crossrider extensions.
- Does not effect Firefox or Safari.

Videos describing the issue:
https://www.youtube.com/watch?v=exLyo...
https://www.youtube.com/watch?v=8hXRL...

When the user types a URL into the Chrome address bar, Chrome gets smart and starts pre-fetching the page. If the site returns 304 Not Modified, Chrome will load the page from the cache before the user has finished typing the URL, and Crossrider will then try and inject the extension script for that tab. However, Chrome will not start a new tab process for the page until the user hits enter. So Crossrider attempts to execute code on tab that does not yet exist and fails with the following error code in the background.html console:

___START___
tabs.get: No tab with id: 354.
at Object.Crossrider.addUserScripts (chrome-extension://geiodgjbfgibbmimohdnafognnibklfo/js/background.js:1:21678)
at Object.Crossrider._onRequest (chrome-extension://geiodgjbfgibbmimohdnafognnibklfo/js/background.js:1:19860) lastError:29
set
___END___

Disabling the Chrome setting: "Settings > Privacy > Predict Network Actions" prevents Chrome's pre-fetching behavior. Once disabled, this race-condition disappears.

Note: the pre-fetching behavior only happens when the user does not press enter to load the new page within 1 second.

May relate to: https://getsatisfaction.com/crossride...

Please could you let me know if there is a known work-around, or a fix in the pipeline for this? This issue will determine whether we decide to use Crossrider to deliver our extension.

Thanks for your time.

Alistair

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Shlomo (Official Rep) July 31, 2013 12:23

Hello Alistair,

Thank you for the detailed information relating to your issue.

We tried to reproduce the problem, even using your extension and the Charles Proxy server, but we cannot see the errors you see in the videos (see images) you produced which makes debugging impossible.

What I have done (after all the testing) is to rebuild your Chrome package and hence please try uninstalling the extension, clearing the cache, and reinstalling.

Let me know if the problem persists and perhaps we can arrange a TeamViewer session to try and diagnose the problem.

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Hello Alistair, Thank you for the detailed information relating to your issue. We tried to reproduce the problem, even using your extension and the Charles Proxy server, but we cannot see the errors you see in the videos (see images) you produced which makes debugging impossible. What I have done (after all the testing) is to rebuild your Chrome package and hence please try uninstalling the extension, clearing the cache, and reinstalling. Let me know if the problem persists and perhaps we can arrange a TeamViewer session to try and diagnose the problem. <a href="https://d2r1vs3d9006ap.cloudfront.net/s3_images/934112/Capture.PNG?1375273401"><img src="https://d2r1vs3d9006ap.cloudfront.net/s3_images/934112/Capture_inline.PNG?1375273401" alt="" /></a>

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Alistair MacDonald July 31, 2013 14:33

Thanks for looking into this.

1) First I cleared my cache completely.
2) Then I un-installed, and re-installed the extension.
3) I restarted the browser.

Tried to reproduce the error. At first there was no error.

I visited 3 or 4 sites starting with the letter "G", to build up Google's cache.

Then started slowly typing, "G... O...." and the error came up again.

"tabs.get: No tab with id:"

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Thanks for looking into this. 1) First I cleared my cache completely. 2) Then I un-installed, and re-installed the extension. 3) I restarted the browser. Tried to reproduce the error. At first there was no error. I visited 3 or 4 sites starting with the letter "G", to build up Google's cache. Then started slowly typing, "G... O...." and the error came up again. "tabs.get: No tab with id:"

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Shlomo (Official Rep) August 01, 2013 11:24

Hello Alistair,

When you reinstalled, did you download the latest build from http://crossrider.com/download/EXTN_ID where EXTN_ID is your extension id?

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Hello Alistair, When you reinstalled, did you download the latest build from http://crossrider.com/download/EXTN_ID where EXTN_ID is your extension id?

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Alistair MacDonald August 01, 2013 14:18

Yes I did re-install the extension this way.

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Yes I did re-install the extension this way.

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Shlomo (Official Rep) August 06, 2013 06:13

Hello Alistair,

The dev team have investigated the issue and have a solution in hand. However, since its a major change in the way we load our extension we need to take into account backward compatibility and it will take some time.

Therefore, we hope to release the new solution within a month after we have performed extensive testing and it's passed QA.

For the information about it's release, I recommend that you monitor our changelog and/or changelog RSS feed.

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What's the status of this problem?

Hello Alistair, The dev team have investigated the issue and have a solution in hand. However, since its a major change in the way we load our extension we need to take into account backward compatibility and it will take some time. Therefore, we hope to release the new solution within a month after we have performed extensive testing and it's passed QA. For the information about it's release, I recommend that you monitor our <a href="http://docs.crossrider.com/#!/guide/changelog" target="_blank">changelog</a> and/or <a href="http://docs.crossrider.com/guides/changelog/rss.php" target="_blank">changelog RSS feed</a>.

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Alistair MacDonald August 06, 2013 13:23

Thanks for your support Shlomo! Good to hear this is something your team is working on.

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Thanks for your support Shlomo! Good to hear this is something your team is working on.

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Shlomo (Official Rep) August 26, 2013 14:57

Hello Alistair,

We just released an update Chrome framework that address this issue. Please try reinstalling the extension and let me know if the problem is resolved. For users that already have the extension installed, the update will be pushed automatically within the usual 6 hour update window.

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Hello Alistair, We just released an update Chrome framework that address this issue. Please try reinstalling the extension and let me know if the problem is resolved. For users that already have the extension installed, the update will be pushed automatically within the usual 6 hour update window.

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Alistair MacDonald August 26, 2013 17:43

Thanks so much for the quick turn around Sclomo!
I will get to testing this in the next couple of days and updated you with me results.

Thanks again!

Alistair

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Thanks so much for the quick turn around Sclomo! I will get to testing this in the next couple of days and updated you with me results. Thanks again! Alistair

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aaronlev August 30, 2013 17:12

Hi Shlomo, we looked at the solution. While it's better, it's still not ideal because the initialization doesn't happen until the user switches to the new tab. This causes the page to first show up without our changes to it, and then suddenly the changes occur. Can it be changed so the changes occur before the user switches to that tab?

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Hi Shlomo, we looked at the solution. While it's better, it's still not ideal because the initialization doesn't happen until the user switches to the new tab. This causes the page to first show up without our changes to it, and then suddenly the changes occur. Can it be changed so the changes occur before the user switches to that tab?

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Shlomo (Official Rep) September 01, 2013 09:00

Hello Aaron,

I will check with the dev team and let you know.

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Hello Aaron, I will check with the dev team and let you know.

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Shlomo (Official Rep) September 01, 2013 09:36

Hello Alistair,

In general, our extension run once the page is loaded and hence you see the behaviour you mention.

We do have the appAPI.dom.onDocumentStart methods that run when the page starts to load and injects code/CSS directly into the page which may meet your requirements. But please be aware that since the code is injected directly into the page the code you inject cannot use any of our API methods (because it runs in the HTML page scope).

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Hello Alistair, In general, our extension run once the page is loaded and hence you see the behaviour you mention. We do have the <a href='http://docs.crossrider.com/#!/api/appAPI.dom.onDocumentStart' target='_blank'>appAPI.dom.onDocumentStart</a> methods that run when the page starts to load and injects code/CSS directly into the page which may meet your requirements. But please be aware that since the code is injected directly into the page the code you inject cannot use any of our API methods (because it runs in the HTML page scope).

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