Suggest to use firefox-bookmarks which use native api, and should support extensive completion frameworks.
Complete Firefox bookmarks with Ivy.
There is a pull request feat: firefox bookmarks by tangxinfa · Pull Request #1593 · abo-abo/swiper devote to include it in Ivy, once this objective reached, this project will destroy.
Install counsel-firefox-bookmarks
(add-to-list 'load-path "<path-of-counsel-firefox-bookmarks>")
(require 'counsel-firefox-bookmarks)
Start search firefox bookmarks with Ivy
M-x counsel-firefox-bookmarks
This requires HTML bookmark export to be enabled in Firefox. To do this, open
URL about:config in Firefox, make sure that the value of the
setting "browser.bookmarks.autoExportHTML" is "true" by, say,
double-clicking it, and then restart Firefox.