The Search function of my firefox browsing history doesn't work. I key the combination of CTRL + H to initiate the "History" left side panel. Then, I used to be able to key-in text into the Search feature and have it bring up relevant web sites that I visited in the past. However, suddenly, over the past three weeks or so, the keyword history Search feature no longer works, despite my saved history of web site browsing is still listed, after keying the CTRL + H combination.