I have hundreds of bookmarks to go through from almost 20 years of browsing, which all diverged from the same Opera 5 bookmarks file on my Thinkpad 365 that I used until ~2002. I need to be able to find duplicates, cut/copy/paste, move things between folders, etc., and delete them easily with ONE BUTTON. Otherwise this whole process will be an unbelievable grind. Manually editing an HTML file in a text editor sounds neither simple, quick, nor fun.
And yes, I do want to keep a lot of the historical ones so I can look them up in Wayback Machine, etc. I don't use these in my "daily driver" browsers anymore.
My thought are likewise.
A simpler idea would be to drag you bookmark to the desktop and put them all in a single folder and use open with option to pick your browser.
I think that only works on Windows? I did try storing files in a directory structure but there's seemingly no way to store web links as files and have them be compatible across all three platforms. Windows uses .urls, Linux uses multi-purpose .desktop files which have a different structure, and OS/X uses zero-byte .webloc files with the actual URL stored in the resource fork. Great.
Aside from the browser independent side, older Opera (up to 12.x) releases had a very good bookmarks manager that could import from and export to various other browsers and also interchange formats...
To be honest, if Opera hadn't screwed over their bookmarks functionality when they switched engines, we wouldn't even be having this conversation. 😜 I'm basically looking for a standalone version of Opera 12 bookmarks manager. Maybe I should just reinstall O12 for this specific purpose, but I'd like a system that's more future-proof.
I've found a few programs that seem to do what I want, but they're all old (~2005-2010ish) unmaintained Win32 apps. If I had the energy to put a bunch of weeks of work into this, I'd honestly be thinking of writing my own; maybe a fork of PCManFM or something.
There's also Buku which seems to be the favorite among the Arch/LFS/Gentoo crowd. It's a command-line app. It's universally described as "powerful", but I can't think of a worse thing to be a command line app. I haven't tried it yet.