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Firefox and Firefox Beta will lock up and quit responding at times.

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Several times ill be looking at something, often when I'm typing out something, as I am now, Firefox and or Firefox Beta will lock up and quit responding to anything I do. I must exit it, or wait til I get the message "Firefox has quit responding. Wait or Close? This is occurring on my Android tablet. 4.0.3 version.

Several times ill be looking at something, often when I'm typing out something, as I am now, Firefox and or Firefox Beta will lock up and quit responding to anything I do. I must exit it, or wait til I get the message "Firefox has quit responding. Wait or Close? This is occurring on my Android tablet. 4.0.3 version.

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are you using any Addons?

Could try by uninstall and reinstall it