The height of the Widget Overflow Menu needs to be increased in order to work properly for extension popups.
In my customizations thread, the code for the Widget Overflow Menu height is located at the bottom of the popups.css file. There is also code for its position in the browser.css and alt-browser.css files.
Be sure to use the updated versions of these files in the Updates comment on that thread. Also note that this comment has some minor updates to some of my other customizations. (I am unable to edit my original post in that thread, thus the comments)
Are you talking about the popup when you tap+hold on an active/selected text field? I just checked, and there was no flickering, however I usually just use the touchscreen keyboard to CTRL+C and CTRL+V since I have those buttons permanently on my keyboard. My keyboard customizations are in this comment in my customization thread.
With that said, there still might be things that I missed. Anyone that finds something should leave a comment in the customization thread so I or others can see it and look into fixing it.
PureMaps Flatpak in the FlatHub repo.
If you’re not against using a web browser for maps, I have a better option:
Use Duckduckgo as a proxy for Apple Maps (requires javascript).
If you do a Duckduckgo search with javascript disabled, it will redirect you to one of the lite versions of Duckduckgo. But if you allow the Duckduckgo site to use javascript, the search results page will have additional options that the lite versions do not. Besides the Images, Videos, and News search tabs, there is now a Maps search tab.
The Maps search on Duckduckgo uses Apple Maps but proxies all connections through Duckduckgo. This means that you will not need to allow Apple domains to use javascript, and you will not directly connect to Apple domains at all.
Here is a quick link to go directly to the Duckduckgo Maps search tab:
https://duckduckgo.com/?q=.&ia=web&iaxm=start
Note that I used a single period character as the search term. You can use whatever you want, but using special characters like period will load a clean Maps page without any searches. Instead it shows the “home” page for the Maps search, which includes quick buttons for searching the currently displayed area of the map for various things (Restaurants, Hotels, Bars, Groceries, Banks, Parking, Coffee, and Parks).
I don’t currently need maps, so I’m waiting for the default Gnome Maps app to support offline maps and GPS navigation (I couldn’t get GPS to work yet).