Please reopen existing tabs and windows after upgrade

[lunar]

One thing that prevents me for applying upgrade straight away is that I know I'm going to loose the currently opened tabs and windows. When I'm in the middle of a large project with 40+ research documents, I really don't want to loose all that.

What would help would be to know that existing tabs and windows are going to be reopened after I click the “Restart” button.

[cypherpunks]

This depends on the user's privacy preferences. "Remember history" is "never" by default (as it should). If you let the browser remember some history, you can then set "Preferences->General->When Tor Browser starts" to "Show windows and tabs from last time".

A hack that doesn't require remembering history is temporarily abusing the "home page" preference: before restarting set the home page to all current tabs (it will record them as "url1|url2|..."); then once restarted, load your home page(s) (this will load all the URLs in different tabs); finally, reset the home page preference.

[teor]

I can imagine a few ways this could go wrong - what if the browser crashes during update and leaves disk traces?

[lunar]

I had more in mind something like using an environment variable or passing data from one process to the next through a dedicated socket, so that nothing gets written on disk.

[bugzilla]

Replying to lunar:

I had more in mind something like using an environment variable or passing data from one process to the next through a dedicated socket, so that nothing gets written on disk.

Tor Browser passes session to Updater, update fails, user has relied on Updater and hasn't saved session - great!
See https://trac.torproject.org/projects/tor/ticket/10400#comment:20
The same recommendation: close as INVALID.