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I deleted a Bookmark folder. I went to imp/exp. and clicked restore for today, and several more and got an "unable to process backup files" and lost 2 years?
I tried to restore deleted bookmarks following your directions and got a "unable to process backup files" response along with loosing approximately 2 years of bookmarks with valuable info in the Tags section. Please help!!!!
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Type about:support<Enter> in the address bar.
Under the page logo on the left side you will see Application Basics. Under this find Profile Folder. To it’s right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.
Enter the bookmarkbackups folder. This is where Firefox makes backups of your bookmarks. Look for the jsonlz4 file you want to restore (check the time / date / size). Right click on that file and select Copy. Now go back to the profile folder where you started. Rename the file places.sqlite by adding .old to it. Now right click in the folder and select Paste. The file you just pasted here, rename it to places.sqlite. After you are done, restart Firefox.