User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0

Steps to reproduce:

Bug discovered during Firefox Developer Edition 66 Beta 14 testday - Friday, March
8th 2019

Steps to reproduce:

1.Open Firefox Developer with a clean profile
2.Navigate to about:config page
3.Click the "I accept the risk!" button
4.Search for the "extensions.screenshots.system-disabled" pref, set it to "false"
5.Set the "extensions.screenshots.system-disabled" pref to "true"
6.Set again the "extensions.screenshots.system-disabled" pref to "false"

Actual results:

Actual results:

It does not appear to matter whether the value of "extensions.screenshots.system-disabled" pref, set it to "false" or "true". For both values the screenshot icon is displayed and active.

Expected results:

1. When "extensions.screenshots.system-disabled" pref, is set to "true" the screenshot icon should not be displayed.
2. When "extensions.screenshots.system-disabled" pref, is set to "false" the screenshot icon is displayed.

If this turns out to be a genuine bug I would like to work on the fix if possible. Thank you.

Link to issue in Github https://github.com/mozilla-services/screenshots/issues/2916

Thank you, ithompson4 for logging this issue.
The prefcodes provided in the description(extensions.screenshots.system-disabled, extensions.screenshots.system-disabled, extensions.screenshots.system-disabled) were used in Firefox 56. Now we use "extensions.screenshots.disabled", if its value is false: the feature is activated.

Taking into account what I have stated above, I am afraid I have to close this issue as invalid.

Have a nice day!