Go to your local department/electronics store and look around for a UPS (Uninterruptible Power Supply) that is useful for you. The lowest price is $50 +. There are also units on the market that plug into the computer. So, if the battery gets low, it will shut down the computer to protect it.

When you use sync, all selected data is shared with all members of the sync. There is no master when using sync. Example: You have a bookmark on one member, but not on the other: The other will get that bookmark. Example: You make a change (anything) on one member, all members get that same change. You can use sync to share passwords, bookmarks, and history. Anything else may not be compatible between different browser versions or computer systems. If you have any questions, ask before using sync. https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer Sync your bookmarks, history, passwords, add-ons and open tabs with another copy of Firefox. Learn how to set up Sync. https://support.mozilla.org/en-US/kb/how-do-i-choose-what-types-information-sync-firefox We'll show you how to choose which types of information (bookmarks, history, add-ons, and passwords) to share across all your devices through Firefox Sync. https://support.mozilla.org/en-US/kb/firefox-sync-troubleshooting-and-tips https://support.mozilla.org/en-US/kb/sync-firefox-bookmarks-and-browsing-history-iOS Sync your passwords, history, tabs and other browsing information across your iOS, Android and desktop computers with Firefox Accounts.