updated known issues

README.MD

@@ -65,6 +65,8 @@ See https://addons.mozilla.org/en-US/firefox/addon/single-file/statistics/?last=
 - Chrome:
   - You must enable the option "Allow access to file URLs" in the extension page to display the infobar when viewing a saved page, or to save a page stored on the filesystem.
   - If the filename of a saved page looks like "56833935-156b-4d8c-a00f-19599c6513d3", disable the option "Misc > Save pages in background". Reinstalling the browser may also fix this issue.
+- Firefox:
+  - The "file name conflict resolution" option does not work if set to "prompt for a name"
 
 ## Troubleshooting unknown issues
 Please follow these steps if you find an unknown issue:

extension/ui/pages/help.html

@@ -447,6 +447,11 @@
 								also fix this issue.</li>
 						</ul>
 					</li>
+					<li> Firefox <ul>
+							<li>The "file name conflict resolution" option does not work if set to "prompt for a name".
+							</li>
+						</ul>
+					</li>
 				</ul>
 			</li>
 			<li> <a id="unknown-issues">Troubleshooting unknown issues</a>