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New Firefox 40.0 Extremly Slow in MC OS X 10.10.5. I mean dreadfully slow. Does not keep up with typing, closing windows, all are very slow in responding.

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Since downloading the New Firefox 40.0 WebBroswer, it is extremely slow and unresponsive. Cannot keep up with simple typing in emails, can't close or open windows without a delay. As I write this message, type has a hard time keeping up. Only isnce loading the latest version has Firefox become buggy. I go to Safari and it zooms along. Also Firefox refuses to play videos on certain websites, yet Safari plays them with no problems. It is like it has to think about then think about it again, before it opens anything.

Very Slow, am about to change to back Safari

Since downloading the New Firefox 40.0 WebBroswer, it is extremely slow and unresponsive. Cannot keep up with simple typing in emails, can't close or open windows without a delay. As I write this message, type has a hard time keeping up. Only isnce loading the latest version has Firefox become buggy. I go to Safari and it zooms along. Also Firefox refuses to play videos on certain websites, yet Safari plays them with no problems. It is like it has to think about then think about it again, before it opens anything. Very Slow, am about to change to back Safari

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HI rockinRcdn, Please update to the most recent version of Firefox:

Please also see these troubleshooting steps: