I have hundreds of bookmarks stored across dozens of folders based on topic. I've been burned in the past with Google changing their search algorithm and not b

I have hundreds of bookmarks stored across dozens of folders based on topic. I've been burned in the past with Google changing their search algorithm and not being able to find material easily, so I just bookmark everything I want to refer to later now. To that end, I primarily use Firefox and periodically archive them using the "Import and Backup" option from the bookmarks folder. That works alright as it produces an HTML file with the entries, but I'd like something more program independent. Does anyone know a good utility for offline archiving of bookmarks in a mostly browser independent way?