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+====== Firefox: optimize the Places database from time to time ======
+In your Firefox profile there's an sqlite database called Places, which after a while starts resembling a swollen Swiss cheese with holes. That might slow your Firefox down.
+You can speed your Firefox up a bit, by optimizing (vacuuming) that database: you can namely deflate that swollen Swiss cheese into a compact smaller cheese. As follows:
+Type the following in the URL bar of Firefox:
+//about:support//
+Press Enter.
+Almost at the bottom of the page you get to see then, there's a header called //Places Database//. Click there on the button called //Verify Integrity//.
+You're done! Repeat this on a monthly basis, so that your Firefox won't lose speed again because of a swollen database.