Live Bookmarks Refresh Rate
Sometimes people ask how often Firefox refreshes live bookmarks.
The default is set to 30 minutes, but you can change that.
Enter about:config in the location bar.
Right-click anywhere within the list of preferences and select New -> Integer.
When you get asked to enter the preference name, enter:
You will then be asked to enter a value. Set the value to whatever refresh rate you’d like. The unit for the value is seconds, so if you wanted the refresh rate to be 5 minutes, the value would be 300 (as in 300 seconds).