The easiest way to do this, to my knowledge, is to get your bookmarks onto Firefox for Desktop.

Basically,

1. Create a Firefox account on your desktop. Use an email generated with a masking service, or maybe even a throwaway one.
2. Login with both your desktop, and when that's done, your mobile device
3. Sync the bookmarks
4. Destroy the Firefox account, if you want. If you used a true throwaway email, don't skip this.

Search for some addon using "desktop view" on addons.mozilla.org

I thought you wrote “null” for a second. Extremely fast backup target.

Unless you want to add in your firefox login info to mull best option would be adding each bookmark to a spreadsheet and ~ manually adding each bookmark to your new browser ~

Edit: got a case of 2am brain over here and forgot an easier way. After saving the spreadsheet make sure its formatted correctly as hyperlinks that way you can export the spreadsheet as an HTML file. Depending on what desktop browser you can then import the HTML file in your bookmark manager

hamburger menu -> bookmarks -> manage bookmarks (popup window) -> import and backup

edit: was for mullvad, did not know mull is a other browser.