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How to open .jsonlx4 files
Firefox does open .json files, but it doesn't open .jsonlx4 files which is how Firefox appears to be storing my bookmarks now. Might there be an adjustment to make?
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Restoring bookmarks needs to be done from within Firefox.
Firefox automatically makes backups of the bookmarks. These are stored in the bookmarkbackups folder.
Open the Bookmarks Manager; Press the Alt or F10 key bring up the tool bar, and select Bookmarks. Hot key is <Control>(Mac=<Command>) <Shift> B.
Once the window is open, at the top of the page, press the button labeled Import and Backup. Select Restore. From the list, pick the file you want and click it.
The backups are stored in a jsonlz4 file named something like this; bookmarks-2016-06-29_1424_enD1GTHya0JmicnYWg4V4g==.jsonlz4 In this example; 2016-06-29 = date created, 1424 = number of entries.