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How to sync multiple open windows (and their open tabs) between computers?

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I often work on several computers. On each computer I would have multiple firefox windows open. Sometimes each computer would have anywhere from 5-10 different firefox windows open at the same time. Then each of these windows would have multiple tabs open. At times each of the open windows could have anywhere from 15 or more individual tabs open.

So in total there could be about 150 + different tabs open all at the same time.

(eg) WINDOW 1 Tab 1 Tab 2 Tab 3 ---> Until Tab 15

WINDOW 2 Tab 1 Tab 2 Tab 3 ---> Until Tab 15

The same would be for WINDOW 3, 4, 5, 6 --> 10 etc

Have have just started using the sync function. But when I go on the other synced computers, under the "History" tab it shows "Tabs from Different Devices". When I open this it does not show ALL of the open tabs from the other computer that it is synced with.

Please help . . .

Is there a limit as to how many open tabs can be synced?? If so what is this?? How does it determine which tabs will be synced and which ones will not be?

Also I have chosen to sync the browsing history. Where is the browsing history synced? Is it merged somewhere or are there still individual records kept somewhere??

Also does the sync function slow down the computer??

I often work on several computers. On each computer I would have multiple firefox windows open. Sometimes each computer would have anywhere from 5-10 different firefox windows open at the same time. Then each of these windows would have multiple tabs open. At times each of the open windows could have anywhere from 15 or more individual tabs open. So in total there could be about 150 + different tabs open all at the same time. (eg) WINDOW 1 Tab 1 Tab 2 Tab 3 ---> Until Tab 15 WINDOW 2 Tab 1 Tab 2 Tab 3 ---> Until Tab 15 The same would be for WINDOW 3, 4, 5, 6 --> 10 etc Have have just started using the sync function. But when I go on the other synced computers, under the "History" tab it shows "Tabs from Different Devices". When I open this it does not show ALL of the open tabs from the other computer that it is synced with. Please help . . . Is there a limit as to how many open tabs can be synced?? If so what is this?? How does it determine which tabs will be synced and which ones will not be? Also I have chosen to sync the browsing history. Where is the browsing history synced? Is it merged somewhere or are there still individual records kept somewhere?? Also does the sync function slow down the computer??

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After experimenting, each sync is scheduled on the each individual device and after all of them have completed, the about:sync-tabs page shows the updated tabs. It is not realtime, it seems to take a few minutes. This being the case, a fresh login did speed this up. If I logged out of the firefox account on my mobile device and logged in, I immediately saw the tabs on the about:sync-tabs page.

There is no limit to how many can be synced. There is a number of tabs that make it to the queue for the next scheduled sync. The tabs are done by a time interval as far as I noticed in the experiment.

The history is indeed merged with the history from other devices. It is merged the synced to each of the devices over an interval of time.