You can bookmark a single tab via the right-click context menu in three sidebar and you can open all synced tab as tabs in Firefox and then use bookmark all tabs. I'm not aware of a way to bookmark all synced tabs directly.

I see, opened the 400+ tabs. Ah, the sound of computer fans at full speed, hoping the browser wouldn't crash. I was lucky this time.

As I was bookmarking the tabs, I didn't really need to actually open them. Is there a way to just get the tabs on the tab bar without opening them?

Thanks

You can PIN to tab or else go Bookmark or use Windows NotePad to save the URL so you don't have backlog in bookmark and only copy and paste them to the URL when you need them.

Unless something has changed, I don't think Firefox has a built-in feature to "Bookmark All Sync'd Tabs" (listed in the sidebar).

At someone's request, I posted a script you can run in Firefox's Browser Console (Ctrl+Shift+J) to generate an HTML Export-style bookmark file of the list of tabs. In case you want to take a look (you need to change a setting to enable the command line in the Browser Console before you run this the first time):

Export Synced Tabs List to "bookmarks.html" file (Browser Console script)

jscher2000: Nice, thank you. I ran the script and copied pasted the content of the resulting bookmark file to a browser bookmark file and imported it in Firefox (may take time if you have a huge bookmark file). They showed up in the library window just as other bookmarks, so this worked the way I hoped it would.

Dropa: You're talking about working on individual tabs here? This is cumbersome with many tabs.

At someone's request, I posted a script you can run in Firefox's Browser Console (Ctrl+Shift+J) to generate an HTML Export-style bookmark file of the list of tabs.

Works like a charm for me too! Thank you!