(browser) Closes #149 Image capture not working on Chrome browser

[onlinesid]

Platforms affected

browser

Motivation and Context

#149

Description

Fixes the problem described in the mentioned issue and a couple of other related issues encountered while trying to get capture image to work.

Testing

Chrome: Version 81.0.4044.92 (Official Build) (64-bit) Linux Ubuntu 18.04
Chromium: Version 80.0.3987.163 (Official Build) Built on Ubuntu , running on Ubuntu 18.04 (64-bit)
Firefox: 75 (64bit) Linux (Ubuntu 18.04 64bit)

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary