hello, accordung to your system information you're using a beta version of firefox which is receiving updates twice a week - this is to be expected when using a pre-release version! install firefox 39 if you want to go to the release version instead: How to download and install Firefox on Mac

in regard to the crashes you've mentioned, could you provide your latest few submitted crash reports? please enter about:crashes into the location bar, copy the latest few report ids from there starting with bp- & paste them here into a forum reply. this will give us a better understanding what may be triggering those crashes.

AdapterDeviceID: 0x 166 AdapterVendorID: 0x8086 Add-ons: %7B1C177B10-F72F-11E1-A21F-0800200C9A66%7D:4.4.1,%7B972ce4c6-7e08-4474-a285-3208198ce6fd%7D:40.0,jid1-QpHD8URtZWJC2A%40jetpack:4.1.2.1-signed,info%40youtube-mp3.org:1.0.9.1-signed AsyncPluginInit: 1 BuildID: 20150702173756 CrashTime: 1436220925 EMCheckCompatibility: true EventLoopNestingLevel: 1 FramePoisonBase: 7ffffffff0dea000 FramePoisonSize: 4096 InstallTime: 1436027428 Notes: AdapterVendorID: 0x8086, AdapterDeviceID: 0x 166GL Context- GL Context+ WebGL- WebGL+ ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} ProductName: Firefox ReleaseChannel: beta SecondsSinceLastCrash: 33742 StartupTime: 1436187186 TelemetryEnvironment: 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166","subsysID":null,"RAM":null,"driver":null,"driverVersion":null,"driverDate":null,"GPUActive":true}]}},"settings":{"blocklistEnabled":true,"isDefaultBrowser":true,"e10sEnabled":false,"telemetryEnabled":false,"locale":"en-US","update":{"channel":"beta","enabled":true,"autoDownload":true},"userPrefs":{"browser.cache.disk.capacity":358400,"browser.formfill.enable":false,"browser.newtabpage.enhanced":true,"browser.shell.checkDefaultBrowser":false,"browser.startup.homepage":"<user-set>","layers.acceleration.disabled":true,"network.proxy.autoconfig_url":"<user-set>","places.history.enabled":false,"privacy.donottrackheader.enabled":true}},"profile":{"creationDate":16025},"addons":{"activeAddons":{"{1C177B10-F72F-11E1-A21F-0800200C9A66}":{"blocklisted":false,"description":"Download Web Videos from Youtube and other popular video sharing sites in a click.","name":"Video Converter","userDisabled":false,"appDisabled":false,"version":"4.4.1","scope":1,"type":"extension","foreignInstall":false,"hasBinaryComponents":false,"installDay":16410,"updateDay":16410},"jid1-QpHD8URtZWJC2A@jetpack":{"blocklisted":false,"description":"Intelligent manager for proxy modules available on proxmate.me!","name":"ProxMate","userDisabled":false,"appDisabled":false,"version":"4.1.2.1-signed","scope":1,"type":"extension","foreignInstall":false,"hasBinaryComponents":false,"installDay":16552,"updateDay":16583},"info@youtube-mp3.org":{"blocklisted":false,"description":"Includes a button on any YouTube Video page that allows its users to make use of the YouTube mp3 technology to obtain a private copy off that video broadcast which they can download.","name":"YouTube mp3","userDisabled":false,"appDisabled":false,"version":"1.0.9.1-signed","scope":1,"type":"extension","foreignInstall":false,"hasBinaryComponents":false,"installDay":16573,"updateDay":16583}},"theme":{"id":"{972ce4c6-7e08-4474-a285-3208198ce6fd}","blocklisted":false,"description":"The default theme.","name":"Default","userDisabled":false,"appDisabled":false,"version":"40.0","scope":4,"foreignInstall":false,"hasBinaryComponents":false,"installDay":16022,"updateDay":16620},"activePlugins":[{"name":"DivX Plus Web Player","version":"3.2.4.1250","description":"DivX Web Player version 3.2.4.1250","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["video/vnd.avi","video/msvideo","video/avi","video/divx","video/divxdps","video/x-msvideo"],"updateDay":16395},{"name":"Java Applet Plug-in","version":"Java 8 Update 45","description":"Displays Java applet content, or a placeholder if Java is not installed.","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["application/x-java-applet;version=1.4","application/x-java-applet;version=1.2.1","application/x-java-applet;version=1.2.2","application/x-java-applet;version=1.3","application/x-java-applet;javafx=8.0.45","application/x-java-applet;version=1.8","application/x-java-applet;jpi-version=1.8.0_45","application/x-java-applet;version=1.1.1","application/x-java-vm","application/x-java-applet;version=1.2","application/x-java-applet;version=1.7","application/x-java-applet;version=1.4.1","application/x-java-applet;version=1.1.2","application/x-java-applet","application/x-java-applet;version=1.1","application/x-java-applet;version=1.1.3","application/x-java-applet;version=1.4.2","application/x-java-applet;version=1.6","application/x-java-applet;deploy=11.45.2","application/x-java-applet;version=1.3.1","application/x-java-applet;version=1.5"],"updateDay":16535},{"name":"DivX VOD Helper Plug-in","version":"1.1","description":"DivX VOD Helper Plug-in","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["application/x-divxovshelper"],"updateDay":16541},{"name":"Default Browser Helper","version":"600","description":"Provides information about the default web browser","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["application/apple-default-browser"],"updateDay":16552},{"name":"QuickTime Plug-in 7.7.3","version":"7.7.3","description":"The QuickTime Plugin allows you to view a wide variety of multimedia content in web pages. For more information, visit the <A HREF=http://www.apple.com/quicktime>QuickTime</A> Web site.","blocklisted":false,"disabled":false,"clicktoplay":true,"mimeTypes":["video/x-msvideo","video/3gpp2","audio/mpeg3","audio/mp3","audio/x-caf","audio/mpeg","video/quicktime","audio/x-mpeg3","video/mp4","application/x-sdp","audio/wav","video/avi","audio/mp4","video/x-m4v","audio/x-wav","application/sdp","audio/x-aiff","video/x-mpeg","video/3gpp","video/msvideo","audio/x-mpeg","audio/vnd.qcelp","audio/x-mp3","application/x-rtsp","audio/amr","video/sd-video","audio/aiff","video/mpeg","audio/3gpp2","audio/aac","audio/x-m4b","audio/x-m4p","audio/x-gsm","application/x-mpeg","audio/x-aac","audio/basic","audio/x-m4a","audio/3gpp"],"updateDay":16586},{"name":"Shockwave Flash","version":"18.0.0.194","description":"Shockwave Flash 18.0 r0","blocklisted":false,"disabled":false,"clicktoplay":false,"mimeTypes":["application/x-shockwave-flash","application/futuresplash"],"updateDay":16610}],"activeGMPlugins":{"gmp-gmpopenh264":{"version":"1.4","userDisabled":false,"applyBackgroundUpdates":1}},"activeExperiment":{},"persona":null}} Theme: classic/1.0 Throttleable: 1 URL: http://www.drudgereport.com/ Vendor: Mozilla Version: 40.0 useragent_locale: en-US

This report also contains technical information about the state of the application when it crashed.

please provide the crash id starting with bp- as it's listed on about:crashes - only this will give the full information necessary to take a closer look...