Firefox Synced JSON of tabs to Onetab format
I found this gist https://gist.github.com/dpschen/f13399a880f1e0bf5a968a5aab6d8692 and didn't undetstand how to do the third point, but I found how to get tabs in JSON, and wrote HTML-page to convert it to Onetab format.
Open SyncedJSONtoOnetab.html in browser and just copy synced JSON of tabs to textarea and you get in output textarea Onetab formatted tabs.
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Download and install "About Sync" Firefox extension https://addons.mozilla.org/en-US/firefox/addon/about-sync/ This extension is made for debugging the Firefox Sync.
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Navigate in Firefox to
about:sync
(Since this is not a valid URL, a markdown link is not possible) -
Go to the bottom, find tabs row and choose
Records (table)
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Choose what row you need (see clientName), select and copy all string, thats it!