1473363 - Intervals set by an extension's content script can be cleared by the page

Status: NEW

(WebExtensions :: General, defect, P3)

Description

[Dave Vandyke]

Attachment: interval-demo.zip

User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Steps to reproduce:

1. Install the attached extension
2. Browse to https://static.kzar.co.uk/interval-demo.html
3. Open the developer tools console



Actual results:

The "Interval..." message should appear in the console once a second.


Expected results:

The interval is cleared by the page and therefore that message does not show up.


Notes:
See this Chromium bug https://bugs.chromium.org/p/chromium/issues/detail?id=860320

Comment 1

[David Olah]

I reproduced the issue on Firefox 61.0.1, Firefox 62.0b6 and Nightly 63.0a1 (2018-07-09) [Ubuntu 16.04].

Comment 2

[Nicolas Chevobbe [:nchevobbe]]

Moving this to webExtension.
What must happening is that since the extension page lives in content, if calling clearInterval with an id matching the one returned from the setInterval in the extension, I think this makes sense to clear the interval.

Dave, what's the use case here? Are there content page clearing intervals  with random numbers? Or does it happen that a setInterval from a content script return the same id as a setInterval from the extension?

Comment 3

[Dave Vandyke]

(In reply to Nicolas Chevobbe from comment #2)
> Dave, what's the use case here?

I gave some context about why we care about this [in this comment on the Chromium issue](https://bugs.chromium.org/p/chromium/issues/detail?id=860320#c12), does that help?