Clear file history in Acrobat Reader, Word document and Firefox

In Acrobat Reader:
1) Click Edit in the top menu
2) Select Preferences
3) Click Documents (the first row)
4) Right side under open setting, change the "Documents in recently used list" to 1. You can select from 1 to 10.


In Word document:

• Click the File tab
• Click Recent, you can see a list of your recent files
• Right click the file you want to remove from the list  and select Remove from the list

In Firefox, you can select Start Private Browsing in Firefox tab to let your browsing history not saved.  To clear history in Firefox:

1) Click Firefox tab and click options
2) Click options
3) Click Privacy tab,
4) Click clear your recent history