According to your system info, you have dmi.chassis.type: 10, which is a notebook. What brand and model of notebook is it?
Try adjusting Firefox's setting for High DPI support, which operates as a global zoom factor: (1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful. (2) In the filter box, type or paste pix and pause while the list is filtered (3) The layout.css.devPixelsPerPx preference usually is set to -1.0 which means use the system default. You can change that to 1.0 for 96-dpi dispay and see whether that is what you prefer. And you can increase the size from there in increments, for example, 1.1 for a global "110%" zoom. Please be careful not to set this value to something tiny, as it can be hard to recover from that. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1455286 Title: Firefox appears horribly distorted after upgrade to 38.0 Status in firefox package in Ubuntu: New Bug description: Today when I opened my package manager (muon) to check for updates, I saw there was an update for Firefox, to version 38. I installed this along with other available updates like I always do. Upon restarting Firefox, however, I discovered a nasty surprise. All of Firefox's UI was appearing as if I was on a computer with a much lower screen resolution, and web pages were appearing as if I had massively zoomed in on them. Everything looks many times bigger than it should be: icons, toolbars, tabs, menus, web pages, they're all big. I have no idea how or why this happened. I tried restarting Firefox in safe mode, wondering if it was maybe an incompatible add-on. This did absolutely nothing for me. I began to suspect that the update to Firefox 38 had caused the problem. So I decided to test my theory by downgrading. The only prior version in the repos appeared to be 28.x, but luckily, in my /var/cache/apt/archives/ folder, I found the .deb for the last version of Firefox I had installed - 37.0.2. I opened the .deb and installed it. Upon opening Firefox, everything was normal again -no abnormally large chrome or web pages. I ran the upgrade to Firefox 38 again, and bingo - the problem came back. I ran ubuntu-bug firefox to get Apport going, and then finished up by coming here to Launchpad to submit a report. Attached a screenshot to show the distortion. My computer's native resolution is 1920x1080, and that's what I run. I'll have to stick with 37.0.2 until I get some confirmation that this issue with Firefox 38 has been addressed/resolved. Firefox is unusable with this problem. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: firefox 38.0+build3-0ubuntu0.14.04.1 ProcVersionSignature: Ubuntu 3.13.0-52.86-generic 3.13.11-ckt18 Uname: Linux 3.13.0-52-generic x86_64 NonfreeKernelModules: nvidia AddonCompatCheckDisabled: False ApportVersion: 2.14.1-0ubuntu3.10 Architecture: amd64 BuildID: 20150511103818 Channel: Unavailable CurrentDesktop: KDE Date: Thu May 14 18:22:34 2015 EcryptfsInUse: Yes Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2014-07-28 (290 days ago) InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) IpRoute: default via 192.168.1.1 dev eth0 proto static 172.16.240.0/24 dev vmnet8 proto kernel scope link src 172.16.240.1 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.21 metric 1 192.168.66.0/24 dev vmnet1 proto kernel scope link src 192.168.66.1 Locales: extensions.sqlite corrupt or missing MostRecentCrashID: bp-3c820930-59fa-410c-9358-def442150515 Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so PrefSources: prefs.js [Profile]/extensions/{11b496ea-481a-11dc-8314-0800200c9a66}/defaults/preferences/shooter.js [Profile]/extensions/artur.dubo...@gmail.com/defaults/preferences/fvd_single_setup.js [Profile]/extensions/https-everywh...@eff.org/defaults/preferences/preferences.js Profiles: Profile0 (Default) - LastVersion=38.0/20150511103818 (In use) RfKill: 0: phy0: Wireless LAN Soft blocked: yes Hard blocked: no RunningIncompatibleAddons: False SourcePackage: firefox Themes: extensions.sqlite corrupt or missing UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/23/2011 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: E16F2IG6 V3.0R dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: MS-16F2 dmi.board.vendor: Micro-Star International Co., Ltd. dmi.board.version: To be filled by O.E.M. dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 10 dmi.chassis.vendor: Micro-Star International dmi.chassis.version: To be filled by O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrE16F2IG6V3.0R:bd12/23/2011:svn:pn:pvrTobefilledbyO.E.M.:rvnMicro-StarInternationalCo.,Ltd.:rnMS-16F2:rvrTobefilledbyO.E.M.:cvnMicro-StarInternational:ct10:cvrTobefilledbyO.E.M.: dmi.product.version: To be filled by O.E.M. 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