The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

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I used the reset twice didn't fix that problem

you can check these settings in "about:config" (typed into the url address text box)

browser.download.manager.retention | user set | integer | 0

if it doesn't exist, create it and restart firefox clearing all cache prior.

upon further review, you will have to disable the new user interface.

browser.download.useToolkitUI | user set | boolean | false

you could also change:

browser.download.panel.removeFinishedDownloads | user set |boolean | false

,but this is redundant as nothing is stored.

reference: http://kb.mozillazine.org/About:config_entries

that worked , thank you very much

Note that current Firefox version also maintain a Downloads folder in the Bookmarks and History Manager (Library)

• History > Show All History