Convert a Firefox bookmark backup into an HTML file

Updated 18 October 2026

Firefox saves daily bookmark backups as compressed .jsonlz4 files that only Firefox can open. Drop one here, or a .json backup you made yourself, and get a normal bookmarks HTML file that Chrome, Edge, Brave or another copy of Firefox can import.

🔒 Runs in your browser. Nothing is uploaded.

1Add the Firefox backup

Drop a .jsonlz4 or .json backup hereor click to choose it. Chrome Bookmarks files work too

2Check what was found

3Download

Find Firefox’s automatic backups

In Firefox, type about:support in the address bar.
Next to Profile Folder, click Open Folder (Show in Finder on a Mac).
Open the bookmarkbackups folder. Each file is named with its date, such as bookmarks-2026-10-17_1532_....jsonlz4.
Copy the one from before your bookmarks went missing to your desktop and drop the copy here.

Firefox keeps the last 15 of these automatic backups. Got an old profile folder from another computer or a backup drive? Its bookmarkbackups folder works the same way, even if Firefox isn’t installed on this computer. After a Windows upgrade, Mozilla points to the leftover copy at C:\Windows.old\Users\<your name>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>\bookmarkbackups.

Or restore it inside Firefox

If you only need the backup back in Firefox, Firefox can restore it directly: open the Library (Ctrl+Shift+O), choose Import and Backup, Restore, and pick a date. That replaces all your current bookmarks with the backup. Converting to HTML here instead lets you import the old bookmarks as an extra folder, pick what you need and keep everything you saved since.

Import the file into Chrome

Open chrome://bookmarks (or press Ctrl+Shift+O, Cmd+Option+B on a Mac).
Click the three-dot menu at the top right of the Bookmark Manager and choose Import bookmarks.
Pick the .html file you downloaded. Chrome adds everything in a new folder, usually called Imported at the end of your bookmarks bar (look under Other bookmarks if it isn’t there), and your existing bookmarks stay as they are.

Edge, Brave, Firefox and Safari read the same file. Step-by-step versions: Chrome, Edge, Brave, Firefox and Safari.

What’s in the file

Firefox’s backups hold your Bookmarks Menu, Bookmarks Toolbar and Other Bookmarks folders, with tags and keywords. The converter keeps the folders, titles, addresses, dates added and tags (the CSV has a Tags column). Smart folders such as Recently Bookmarked are queries, so they’re skipped, along with separators. The .jsonlz4 decompression happens in your browser.

Questions

How do I open a .jsonlz4 file?

It’s Firefox’s compressed JSON format. Drop it into the converter above to read it and turn it into an HTML bookmarks file, or restore it inside Firefox from the Library’s Import and Backup menu.

Can I import Firefox bookmarks into Chrome without Firefox installed?

Yes. Convert a backup from the old profile folder here, then import the HTML file in Chrome’s Bookmark Manager.

Is my file uploaded anywhere?

No. The page reads the file with your browser’s own file reader and builds the new file on your computer. You can load the page, turn off Wi-Fi and it still works.

Your bookmarks, on every new tab

Stackboard is a free Chrome extension that lays out your bookmarks as a board on the new tab page. It stores everything as ordinary Chrome bookmarks, with no account.

Add to Chrome, it’s free