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app by right-clicking and selecting ‘Get info’ or hitting Cmd-I. Open it in preview, select all (Cmd-A) and press copy (Cmd-C).
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app to ‘Firefox36.app’ and move it to your /Applications folder
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However, there are still many people using the older 3.6 version of Firefox. Both Chrome and Firefox have a very fast release cycle, where new versions are released every six weeks or so. Most of the bugs you need to fix are probably in older versions of Internet Explorer. Cross-browser testing is pretty essential when developing web sites.
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