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How can I go back to 33.0 after upgrading to 34.0.5?

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I upgraded and I am having problems with slowness and script error. It happens almost ever time I going from one page to another. Tried re-installing and still get error. Tried other things posted and still have same problems. Never had this with previous version. Using MacBook Pro, OSX 10.8.5. Tired of fighting with it and wish to return to previous version.

I upgraded and I am having problems with slowness and script error. It happens almost ever time I going from one page to another. Tried re-installing and still get error. Tried other things posted and still have same problems. Never had this with previous version. Using MacBook Pro, OSX 10.8.5. Tired of fighting with it and wish to return to previous version.

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Here is a link to all of the current versions of Firefox: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/

Here is a direct link to the en-US version 33.0 of Firefox for Mac: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/30.0/mac/en-US/Firefox%2030.0.dmg