[Affected versions]:

• Firefox Nightly 89.0a1 (Build ID:20210328213901);
• Firefox Beta 88.0b (Build ID: 20210328185936)

[Affected Platforms]:

• Windows 10 x64;
• macOS 10.15.7;
• Linux Mint 20;

[Prerequisites]:

• Have the latest Firefox Beta build installed.

[Steps to reproduce]:

1. Open the Firefox browser with the profile from prerequisites.
2. Navigate to "about:logins" page.
3. Open the menu, click the "Import from a file..." option.
4. Select and import a non CSV file.
5. Observe the "Try Again..." button of the "Import Error" modal.

[Expected result]:

• The button is correctly displayed.

[Actual result]:

• The localized "Try Again..." string exceeds the button's area.

[Notes]:

• Attached a screenshot of the issue.

Hello, I'm new to mozilla and want to solve this bug. I built and ran firefox, but the option "Import from a file..." in the menu doesn't appear. Which firefox from the attached URL should I install and will it appear in running firefox? (https://www.mozilla.org/en-US/firefox/channel/desktop/)
And how could I start solving it?

:alieneguzh welcome and thanks for trying to help!

Visit about:config page and turn signon.management.page.fileImport.enabled preference on, then reload about:logins and you shall see that menu entry.

P.S. I'd recommend to use a separate profile for testing, see about:profiles for that.

Thank you for your response.
I followed the steps, and I tried firefox beta: it showed me that it was ok and the string wasn't exceeded -> the button displayed "Повторить попытку импорта..."
And in my built and running firefox nightly, I couldn't change the language, but I downloaded firefox nightly in Russian and it showed me the same "Повторить попытку импорта..." without exceeding.

About profiles, I didn't know that, thank you!

PS: I can attach an image of what it showed me

I suspect it may depend on the page zoom (try Ctrl+Plus or Ctrl+mouse wheel).

I've tried zoom in and out, and it returned the same result. I'll attach an image here.

Looks like the button can fit any content now (Fx 101), so I suppose this bug is fixed by something else.

Note that button can grow beyond dialog box, but it really doesn't worth the effort to fix.

I have verified that this issue is no longer reproducible using the following versions:
Firefox Nightly 101.0a1 RU (Build ID - 20220501190841)
Firefox Beta 100.0b9 RU (Build ID - 20220421201645)
Firefox Release 100.0 RU (Build ID - 20220428192727) on Windows10 x64, macOS 12.3.1 and Linux Mint 20.2.
The “Try Import Again” string does not exceed the button’s area anymore.
However, while we were verifying this issue, we found another behavior which was logged in Bug 1767275.
Considering these, I’m marking this issue as Verified.