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Mozilla Firefox

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Apps

iPhone + iPad

Help Center, release notes, Download

Mac + Safari

Help Center, release notes, Download

Google Chrome

Help Center, Download

Mozilla Firefox

Help Center, Download

Opera

Help Center, Download

Microsoft Edge

Help Center, Download

Support

Download Help Center Supported languages Request a refund Restore password Restore serial codes Privacy policy

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Contact Twitter Blog

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Definition of "いっしんふらん" in Japanese

名・ダナ

一つの事に集中して、他の事のために心の乱れることがないこと。