There is a Clippings Google group over here for support: https://groups.google.com/forum/#!categories/aecreations-help/allquestions I am using Clippings in Firefox 57 on Windows 7 OS and not having that problem - no problems at all.

The System Details list shows an outdated Shockwave Flash plugin. * Shockwave Flash 11.2 r202 You can download the latest Flash player plugin for Firefox on this page. *https://get.adobe.com/flashplayer/otherversions/ ---- It is possible there is a problem with files in the profile folder that store the extensions registry. Delete the extensions.* files (e.g. extensions.json) and compatibility.ini in the Firefox profile folder to reset the extensions registry. *https://support.mozilla.org/en-US/kb/Profiles New files will be created when required. See "Corrupt extension files": *https://support.mozilla.org/en-US/kb/unable-install-add-ons-extensions-or-themes You can check for problems with preferences. Delete possible user.js and numbered prefs-##.js files and rename/remove the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in current Firefox releases. *http://kb.mozillazine.org/preferences_not_saved *http://kb.mozillazine.org/resetting_preferences