Hello, I've noticed very recently that the battery on my macbook air (2013) drains very rapidly. It seems that I can only use it without pluggin it in for half the time I used to use it - and I mean within the last week. In the upper corner where the battery percentage is shown, I get the message under "Apps using significant energy" that Firefox is guilty of high consumption. I have tried all of the fixes in mozilla support and some from websites and nothing changes the outcome of the rapid battery drain. I checked plug-ins, closed and re-started, I don't know what else. Many sites recommend switching to Safari, but all of my bookmarks, etc. are saved on Firefox and I don't want to make a switch. Can someone please help me?

Thanks.