How do I save all tabs

Question

there used to be away to do this

Answer 1

The more information that you provide in your question, the better the chance that you will receive a reply with the solution. Your question can refer to a couple of different Firefox functions.
The reply by '''''the-edmeister''''' is to a question conerning "Bookmark All Tabs". His reply is reasonable. When first reading your question, my thought was the same as '''''the-edmeister's'''''.
If you are referring to "Save tabs on exit", see the following.
Firefox now automatically saves open tabs when closing. When you re-start Firefox, do one of these:
#Restore from History:
#*click ''Firefox button> History > Restore Previous Session''
#*click ''History > Restore Previous Session'', if using the Menu Bar
#Restore from the about:home page:
#*type '''''about:home''''' in the Location/URL bar and choose "Restore Previous Session"
#*See https://support.mozilla.com/en-US/kb/common-questions-after-updating-firefox#w_why-werent-my-tabs-and-windows-restored
#Change your home page setting:
#*Change Options > General tab, change "When Firefox starts:" to "Show my windows and tabs from last time"
#*See [https://support.mozilla.com/en-US/kb/Options%20window%20-%20General%20panel Options window-General Options]
IMPORTANT:
*You must close Firefox using ''Firefox button > Exit/Close'' (or ''File > Exit/Close'' if using the Menu Bar) for this to work properly
*You must have "Remember my browsing history" selected; click ''Firrefox button > Options > Privacy'' (or ''Tools > Options > Privacy,'' if using the Menu Bar'')
**See [https://support.mozilla.com/en-US/kb/Options%20window%20-%20Privacy%20panel Options window-Privacy panel]
*You must not clear "Browsing History" when closing Firefox; click ''Firefox button > Options > Privacy > [X] Clear history when Firefox closes > Exceptions > [ ] Browsing History'' (or click ''Tools > Options > Privacy > [X] Clear history when Firefox closes > Exceptions > [ ] Browsing History'', if using the Menu Bar)
**See [https://support.mozilla.com/en-US/kb/Clear%20Recent%20History#w_how-do-i-make-firefox-clear-my-history-automatically Clear Recent History - How do I make Firefox clear my history automatically]
*You must not be using Private Browsing or start Firefox in permanent Private Browsing
**See [https://support.mozilla.com/en-US/kb/Private%20Browsing Private Browsing]
**Options > Privacy > [ ] Permanent Private Browsing Mode
***See [https://support.mozilla.com/en-US/kb/Options%20window%20-%20Privacy%20panel#w_use-custom-settings-for-history Options window-Privacy panel-Use custom settings for history]
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Not related to your question, but...
You need to update some plug-ins:
*Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.com/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]