Import Arc history in Firefox

arcHistoryToFirefox.md

No good reason why this had to be so tricky:

• Install Export Chrome History extension in Arc
• Export history to JSON. Choosing the forever option does actually export ALL the history in Arc
• Install History Export for firefox
• Optional: Export Firefox history, to see what the json looks like
• Make the Arc history match what firefox expects. I used this javascript to convert it:

arcHistory.map(item => {
    return {
        id: item.id,
        url: item.url,
        title: item.title,
        lastVisitTime: Math.floor(item.lastVisitTime),
        visitCount: item.visitCount,
    }
})

• Not much conversion required, but still, I didn't want firefox to crash because there was extra data, or floating point timestamps
• Import the resulting json file using History Export