Good evening!

Please Enter next link "https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save" and is corrected the problem.

Thank you

Note that 'never remember History' means that you run Firefox in Private Browsing mode.

• https://support.mozilla.org/kb/Private+Browsing

In what way is setting the download location not working?

The last used directory for the website (host) serving the file for download will be preselected in the file picker. If no download directory for the current website (host) has been stored, browser.download.lastDir will be used. You can disable this feature to remember a host based download directory by creating a new Boolean pref on the about:config page with the name browser.download.lastDir.savePerSite pref and set its value to false.

• https://developer.mozilla.org/Mozilla/Preferences/Preference_reference/browser.download.lastDir.savePerSite

Thanks for your assistance. Problem is now solved. Seems that Video Download Helper upgrade over-rides Firefox's set preferences for file download destination and history retention. After making changes to VDH Options> Settings> Storage Directory, I am once again able to download direct to Desktop instead of dwhelper, and downloads history is no longer fixed in Library.