Can anyone help me please? I keep on having this problem...

MOST important: when a select has more than 10 options, I can only see the first 10!

• I tried restoring Firefox and it didn't help • I disabled all CSS and it it didn't help

All I can say... I think the problem is due to a combination of browser and OS I am on FF 57.0.1 + OS X 10.12.6.

Web code should be passing these : HTML https://validator.w3.org/ CSS https://jigsaw.w3.org/css-validator/

I have no idea what your talking about.

uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Do the Mac Equivalent, delete all but profile folders. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 57.0.2 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

If did not fix issue after testing ...... Create a new profile as a test to check if your current profile is causing the problem. See Creating a profile :

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem. Never work with original files.

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Please let us know if this solved your issue or if need further assistance.

See also:

• /questions/1189366 Since upgrading to Quantum all dropdowns only show 8 options

Thanks Pkshadow

I did all you suggested but didn't work. I think I have "isolated" the bug.

I have this buggy behaviour when the Firefox window is displayed on my secondary monitor. I have this configuration • imac 27" retina (5120 x 2880) • Apple cinema display 20" (1680x1050) • OS X 10.12.6 (macOS Sierra)

Pkshadow said

Web code should be passing these : HTML https://validator.w3.org/ CSS https://jigsaw.w3.org/css-validator/ I have no idea what your talking about. uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Do the Mac Equivalent, delete all but profile folders. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 57.0.2 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

If did not fix issue after testing ...... Create a new profile as a test to check if your current profile is causing the problem. See Creating a profile :

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem. Never work with original files.

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Please let us know if this solved your issue or if need further assistance.