User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:19.0) Gecko/20100101 Firefox/19.0 Build ID: 20130307122903 Steps to reproduce: Visit some site with checkboxes. Check a checkbox or search for a already checked one. For example the "CC List" checkbox on this site: https://bugzilla.mozilla.org/show_bug.cgi?id=812389 (Attention: This bug is NOT RELATED to this one, it is just an example.) Problem does not occur everytime, but occurs on many different sites, so it is not site related. Please tell me, if you need more information. Firefox is executed on WindowMaker 0.95.0-crm. Firefox-Version: 19.0.2 Kubuntu-Version: 12.04.02. apt-cache show firefox Package: firefox Priority: optional Section: web Installed-Size: 52464 Maintainer: Ubuntu Mozilla Team <ubuntu-mozillateam@lists.ubuntu.com> Architecture: amd64 Version: 19.0.2+build1-0ubuntu0.12.04.1 Replaces: abrowser, abrowser-branding, firefox-branding, kubuntu-firefox-installer Provides: gnome-www-browser, iceweasel, www-browser Depends: lsb-release, libasound2 (>= 1.0.23), libatk1.0-0 (>= 1.12.4), libc6 (>= 2.15), libcairo2 (>= 1.2.4), libdbus-1-3 (>= 1.0.2), libdbus-glib-1-2 (>= 0.78), libfontconfig1 (>= 2.8.0), libfreetype6 (>= 2.3.9), libgcc1 (>= 1:4.1.1), libgdk-pixbuf2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.31.8), libgtk2.0-0 (>= 2.24.0), libpango1.0-0 (>= 1.14.0), libstartup-notification0 (>= 0.8), libstdc++6 (>= 4.6), libx11-6, libxext6, libxrender1, libxt6 Recommends: xul-ext-ubufox, firefox-globalmenu, libcanberra0 Suggests: latex-xft-fonts, libthai0, firefox-gnome-support Conflicts: gcu-plugin (<= 0.12.10-1ubuntu1) Breaks: abrowser (<= 4.0~b11+build3+nobinonly-0ubuntu1), abrowser-branding (<= 4.0~b11+build3+nobinonly-0ubuntu1), adobe-flashplugin (<= 11.1.102.63-0precise1), firefox-branding (<= 4.0~b11+build3+nobinonly-0ubuntu1), flashplugin-installer (<= 11.1.102.63ubuntu1) Filename: pool/main/f/firefox/firefox_19.0.2+build1-0ubuntu0.12.04.1_amd64.deb Size: 24169064 MD5sum: b63971316eb0623019ef5de8a96bfc63 SHA1: f3835e3122fd73df943d199047e74f529344ad74 SHA256: e20cdb850ed48a0341de3ee6cd05c951f2e61972d904123957079e1526183c61 Description-en: Safe and easy web browser from Mozilla Firefox delivers safe, easy web browsing. A familiar user interface, enhanced security features including protection from online identity theft, and integrated search let you get the most out of the web. Xul-Appid: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} Description-md5: 46b619f510631c4693dc09c1a3778a55 Bugs: https://bugs.launchpad.net/ubuntu/+filebug Origin: Ubuntu Supported: 5y Task: ubuntu-desktop, ubuntu-usb, edubuntu-desktop, edubuntu-usb, edubuntu-desktop-kde, xubuntu-desktop, ubuntustudio-desktop Package: firefox Priority: optional Section: web Installed-Size: 40311 Maintainer: Ubuntu Mozilla Team <ubuntu-mozillateam@lists.ubuntu.com> Architecture: amd64 Version: 11.0+build1-0ubuntu4 Replaces: abrowser, abrowser-branding, firefox-branding, kubuntu-firefox-installer Provides: gnome-www-browser, iceweasel, www-browser Depends: lsb-release, libasound2 (>= 1.0.23), libatk1.0-0 (>= 1.12.4), libc6 (>= 2.15), libcairo2 (>= 1.2.4), libdbus-1-3 (>= 1.0.2), libdbus-glib-1-2 (>= 0.78), libfontconfig1 (>= 2.8.0), libfreetype6 (>= 2.2.1), libgcc1 (>= 1:4.1.1), libgdk-pixbuf2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.31.8), libgtk2.0-0 (>= 2.24.0), libpango1.0-0 (>= 1.14.0), libstartup-notification0 (>= 0.8), libstdc++6 (>= 4.6), libx11-6, libxext6, libxrender1, libxt6 Recommends: xul-ext-ubufox, firefox-globalmenu Suggests: latex-xft-fonts, libthai0, firefox-gnome-support | firefox-kde-support Conflicts: gcu-plugin (<= 0.12.10-1ubuntu1) Breaks: abrowser (<= 4.0~b11+build3+nobinonly-0ubuntu1), abrowser-branding (<= 4.0~b11+build3+nobinonly-0ubuntu1), adobe-flashplugin (<= 11.1.102.63-0precise1), firefox-branding (<= 4.0~b11+build3+nobinonly-0ubuntu1), flashplugin-installer (<= 11.1.102.63ubuntu1) Filename: pool/main/f/firefox/firefox_11.0+build1-0ubuntu4_amd64.deb Size: 18150878 MD5sum: 45afb510e60fdf36ed4feefbb0521acf SHA1: 38065b6de1c1d70cb25a4beb7b5c69ab3be14c08 SHA256: 6a9f7e69c5196ee5d7b64130c00ea7977a2b73e33c5b9dfe9d1c0d6a7efedbda Description-en: Safe and easy web browser from Mozilla Firefox delivers safe, easy web browsing. A familiar user interface, enhanced security features including protection from online identity theft, and integrated search let you get the most out of the web. Xul-Appid: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} Description-md5: 46b619f510631c4693dc09c1a3778a55 Bugs: https://bugs.launchpad.net/ubuntu/+filebug Origin: Ubuntu Supported: 5y Task: ubuntu-desktop, ubuntu-usb, edubuntu-desktop, edubuntu-usb, edubuntu-desktop-kde, xubuntu-desktop, ubuntustudio-desktop Actual results: Hovering over the checkbox renderes the checked status and shows the check mark. Moving the cursor away from the checkbox disables rendering sometimes again. Expected results: The check mark should have been visible without hovering over it.

I think this has happened maybe years ago; it might be related to the GTK, and might be specific to the build. Can you reproduce it with any Mozilla build?

I've found bug 316996, but its effect is different.

I don't think bug 316996 is related to this one as there the problem only occurs in firefox dialogs. I can not reproduce the problem with the Mozilla build from https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/19.0.2/linux-x86_64/de/.