Yesterday I was able to take screenshots by right clicking the moues. Today I cannot.

Hello

If, screenshots.browser.component.enabled, value, false, take screenshot, is not available

Maybe Please verify, the preference, screenshots.browser.component.enabled, defauft value, true

1 - Go to configuration editor https://support.mozilla.org/en-US/kb/about-config-editor-firefox 2 - Enter a search term screenshots.browser.component.enabled you can double-click on the preference to set the value

Did all that and it was on false. Changed it to true and still right click will not show take screen shot command. Also Ctrl+Shift+S does nothing.

Your add-ons? If the case, please disable your add-ons, one by one, to see https://support.mozilla.org/en-US/kb/disable-or-remove-add-ons

Have you restarted Firefox