If you're able to launch Firefox on the other computer, it's best to export your bookmarks. You can create a backup in JSON format, which when imported will replace your current set of bookmarks.

• Restore bookmarks from backup or move them to another computer

Or you can export bookmarks in HTML format. When imported, the bookmarks will be added to your current set.

• Export Firefox bookmarks to an HTML file to back up or transfer bookmarks
• Import Bookmarks from an HTML file

Firefox keeps your history and bookmarks in the places.sqlite file in the profile folder.

• Profiles - Where Firefox stores your bookmarks, passwords and other user data

You can make Firefox create an automatic HTML backup (bookmarks.html) when you exit Firefox if you set the browser.bookmarks.autoExportHTML pref to true on the about:config page.

• http://kb.mozillazine.org/browser.bookmarks.autoExportHTML

That backup is created by default in the profile folder as bookmarks.html every time you close Firefox, but you can set the file name and path via the browser.bookmarks.file pref on the about:config page.

• http://kb.mozillazine.org/browser.bookmarks.file

The browser.bookmarks.file pref doesn't exist by default and you need to create a new String pref with the name browser.bookmarks.file and set the value to the full path of the backup bookmarks file.

Note: an HTML backup doesn't preserve tags and annotations, so you lose those if you need to import the HTML backup.

• http://kb.mozillazine.org/Export_bookmarks

• http://kb.mozillazine.org/about:config