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While Mozilla deserves some heat for abandoning official support of PWAs, for my use this add-on has filled the role just as well: https://github.com/filips123/PWAsForFirefox
Including self-hosting the sync server, if preferred: https://github.com/mozilla-services/syncstorage-rs
Just in case you do not know or you are interested, the Firefox's UI is mere CSS, one can customize it through "chrome/userChrome.css" in the profile folder of the user. I put my tabs under the bookmarks for example, just above the page content, with the template from the CustomCSSforFx[1] project, and modified some colors and icons.
Firefox have also the "Browser Toolbox"[2] -and is homologous to the web development tools- that you can use for to explore the CSS of the UI, select elements, the CSS code, and modify them for to see how would work the modifications before to put them within the userChrome.css
The tabs are under the id=TabsToolbar, so an #TabsToolbar{ display: none !important; } or similar should work, in addition to correct the space that it leaves modifying other params css.
[1] https://github.com/Aris-t2/CustomCSSforFx
[2] https://firefox-source-docs.mozilla.org/devtools-user/browse...