Affected versions

• Firefox 79.0 RC
• Firefox 78.1.0esr
• Latest Nightly 80.0a1
• Nightly 36.0a1

Affected platforms

• Windows 10 64bit
• Ubuntu 20.04
• macOS 10.15.6

Steps to reproduce

1. Open https://www.flipkart.com/
2. Click the right/left arrows in the first slideshow

Expected result

• Images from slideshow are not selected.

Actual result

• Images from slideshow are selected during sliding through them.

Regression range

• This is not a regression since it reproduces back to Nightly 36, older Nightly builds did not display images at all, also this could be a website issue.

Additional notes

• This issue does not reproduce on Chrome.
• IMHO this is a low severity issue - S4
• In the attached video I had the webpage zoomed out, it's not necessary in order to reproduce but could be seen better.

You need to click twice in quick succession to see the problem.

Well, if you click fast enough it will trigger a double-click which will select something, so I'm not convinced there's an actual bug here. An author can avoid that by specifying -moz-user-select:noneon the relevant DOM sub-tree (which might be motivated on the carousel on this web page since there really isn't anything interesting to select there).

Resetting severity so that DOM triage can pick this up.

When I double click on the slide buttons, Chrome select the following word "Deals". So, this must be caused by the difference where should be selected when double clicking on non-text node. It seems that Chrome looks for a text node around double clicked position, and if there are only <img> elements around it, fall back to selecting an <img> element.

I don't know whether this should be aligned to Chrome's behavior because this behavior is not standardized and may be important difference for some users.

I'm not sure who are handling decision about selection behavior at pointing device operation.

The bug has a release status flag that shows some version of Firefox is affected, thus it will be considered confirmed.