This is related to #9773, Enpass is marked as working but I don't see it working properly on my device.
Autofill should work properly
Autofill doesn't work properly
UNITO-UNDERSCORE!054802!Hi, @SS1113 note that I was able to autofill using Enpass, I had 0 issues regarding this app.
Tested with the latest Nightly from 5/15 using Google Pixel 4 XL (10).

@abodea It is not working on my device properly, the autofill prompt appears and disappears quickly when I click the input fields and if I keep clicking the input fields then after 10 seconds or so it works as expected; autofill prompt doesn't disappear I'm able to click on it and autofill. Is there a reason why this is happening on my device?
I have tested again with Fenix: 76.0.0-beta.2 (Build #2015740131) and Nightly 200513 18:00 (Build #2015740115)
It's working as expected on Chrome browser.
Thank you for the response!
I will add this issue to https://github.com/mozilla-mobile/fenix/issues/9773 description as being a device-related issue.
@abodea I have tested it on some more devices: Xiaomi Mi A2 (Android 10),
Realme C3 (Android 10).
These devices are also exhibiting the same issue.
Tested on Fenix: 76.0.0-beta.2 (Build #2015740131)
The issue can still be reproduced on Nightly 200611 06:01.
This can still be reproduced on Nightly 200628 06:01.
What's your Fenix language? Because mine is Turkish and it's not working on it but working on English.
I have set the Fenix language to English (United States) and it is the default language of my phone too. So I set the language to Follow device language in Fenix.
I am the reporter of this issue. Please let me know if I can provide you any more information.
Thanks. :)
Can reproduce this issue on my device as well:
LG Velvet, Android 10 July security patch, Latest Beta playstore v82.
A solution to the disappearing enpass prompt I have found is click the URL bar and then click the password or user field ... the prompt to autofill will stay without doing the disappearing thing.
An update to this... In the latest nightly the issue of the autofill ui seems to be fixed.
Although web domain passing does not seem to work with enpass... it always says "login not found" and you have to manually search your enpass logins to fill them out