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Glossary
Session transfer
A session transfer is moving what keeps an account signed in to the same profile on another computer.
What is actually being moved
A session is more than a cookie. It is the cookie jar, the tokens a site left in storage, the saved logins and the small databases a site keeps about your visits.
Carrying half of it and signing in for the rest is close to not carrying it at all.
Why a fresh sign in is the risk
A sign in is the moment a platform looks hardest. It weighs the device, the address and the hour against everything the account did before.
An account that was quiet for a week and then signs in from a new country is the shape a review gets written about.
How a transfer file is built
The profile is closed first: while its browser is open its databases are being written, and half of them would end up in the file.
- 1
Everything but the cache is packed
Caches are hundreds of megabytes that sites refill by themselves.
- 2
The archive is closed with a password
Whoever opens the file can sign in to those accounts.
- 3
The profile number travels too
The fingerprint is derived from it, so the profile stays the same machine.
- 4
You carry the file yourself
It is an ordinary file, on a disk, a stick or a folder of your own.
A folder instead of a file
The same archive can travel through a folder your own cloud already syncs. A profile closes, its session goes there encrypted, and the other computer takes it before that profile opens.
Nothing sits on our side. The folder is yours, and so is the password that opens what lies in it.
Arriving in a profile that exists
On a second computer the settings have usually arrived already, so the profile is not made a second time. The session is placed inside the one that is there.
The session
Cookies, saved logins, site data and the small databases behind them.
The fingerprint generation
Without it the same profile would arrive as a different machine.
The values you picked by hand
A screen or a graphics card chosen in the editor stays chosen.
The proxy country and the one time code key
Both belong to the account rather than to the computer.
The saved sign in and the extensions
The extensions named in the file are switched on for that profile.
Often confused with
A cookie export
Cookies alone leave storage and saved logins behind, and many sites want both.
A copy of a profile
A copy gets its own number, so to every site it is a different machine.
Settings sync
Names, groups and proxy entries travel by themselves. Sessions never leave a machine on their own.
What this does not do
- It does not move a running profile. Close it first, or half a session ends up in the file.
- It does not merge two sessions. When both computers changed you pick one, and the other is set aside as a copy.
- It does not carry the browser engine. Each computer installs its own.
- It does not bring back a lost password. The archives already written cannot be opened without it, and we keep no copy.
Check it
Every claim above is one place in the product and one stand.
- The file is encrypted, the cache is left out and the number travels
- apps/desktop/src/lib/bundle.js · apps/desktop/test/profile-bundle.js
- A closed profile goes to the folder and the other machine takes it before launch
- apps/desktop/src/lib/sessionSync.js · apps/desktop/test/session-sync-folder.js
- A copy the cloud made beside yours is recognised rather than ignored
- apps/desktop/test/cloud-conflict-copies.js
- What only this machine knows survives an exchange
- apps/desktop/test/sync-preserves-local.js
Questions
- Will I still be signed in on the other computer?
- That is the whole point of it, and the app says plainly whether the session came with the file. If it did not, you sign in again, and the profile itself is there either way.
- How large can one archive be?
- An archive over 400 MB is refused rather than written half way. Caches are dropped first for exactly that reason.
- Can two computers open one profile at once?
- No. The profile is held by the machine that opened it, the second one is told who holds it, and closing it releases the hold.
- Is a cloud folder a safe place for this?
- The file in it is closed with your password, and the password never goes into the folder. A copy the cloud made beside yours is named to you rather than passed over in silence.
- Does the proxy travel with it?
- Yes, with its password. On disk that password is held by the operating system, in the place it holds your other passwords.
Move one profile and see it stay signed in
Two profiles are free, with no card. Transfer one with its session and open it on the other computer.