hello, to what value have you changed the layout.css.devPixelsPerPx preference? you can start with 1.0 and increase or decrease this "zoom factor" in steps of 0.05s go get the pixel density that fits your needs.

It doesn't matter what value i chose because it didn't restore it to how it was. I used to be able to fit 9 tabs on screen and unless i reduce the value such that it's unreadable i can no longer do so. Something has gone wrong with this stupid programme.

could you provide a screenshot of the issue?

Here is how it now looks. Nothing has been changed since i logged off yesterday.

then either try setting layout.css.devPixelsPerPx to 0.8 or something in that region or try to set the dpi settings in windows back to the default (96dpi): http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/display_use_large_or_small_fonts.mspx

that makes it too small.

something has gone very wrong with this programme

Same thing happening to me. View the differences in Firefox and Chrome: http://tinyurl.com/q64gmpd It is really a pain as almost every website now displays a horizontal scroll bar as the zoomed view does not 'fit' into the window.

hello jlford001, firefox 22 is now respecting the pixel density you've set on a system level in the windows control panel > appearance > display. more information about that is available at http://windows.microsoft.com/en-us/windows7/make-the-text-on-your-screen-larger-or-smaller

if you want to set the text size/pixel density in firefox different from that of your system's settings like it was handled in prior versions, enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named layout.css.devPixelsPerPx. double-click it and change its value to 1.0 (or any other zoom factor that fits your purpose: 1.0 relates to 100%, 0.8 equals 80% and so on; -1.0 is the default value and will adhere to the system settings).

I understand that it has been changed, but IMHO, a very bad change... I am not going to change the rest of my system settings so that Firefox works - I'll just use something else. :(

if you've set your operating system to display at 125% then firefox will respect that from version 22 onwards and also display at 125%. the advent of high resolution displays has made it necessary that firefox follows that convention, otherwise it would be unreadably small on such systems.

You must be joking. That setting of Windows is for fonts, not pixel side. At least that's what the Windows option says and that's what users have been using it for, to enlarge fonts.

WHICH OTHER APPLICATION HAVE YOU SEEN TO BEHAVE LIKE MOZILLA DOES NOW? WHICH OTHER WEB BROWSER? DON'T YOU THINK MICROSOFT KNOWS ITS OWN OPERATING SYSTEM WHEN THEY MAKE INTERNET EXPLORER BEHAVE AS IT BEHAVES?

Making EVERY PAGE show scrollabars for users that use larger fonts (because in high resolutions Windows fonts show quite small at 100% and also because there are people who just want their system to use larger fonts because they're elder etc.) is an exteremly silly decision. It hurts both web page designers and users. It is surely a reason for stopping to use Mozilla and suggesting it to others (no, going to advanced settings to turn off that behaviour isn't acceptable remedy).

microsoft's support site describes the setting like this : You can make the text and other items, such as icons, on your screen easier to see by making them larger.

so no indication that the setting should only be confined to font sizes...

let's see: open up Windows 7 and go to Control Panel\Appearance and Personalization\Display

then click on the right handside "Set custom text size (DPI)" (DO YOU READ THE WORD "TEXT" THERE???)

the explanation says "You can change the size of text and other items on your screen by choosing one of these options...", it doesn't say WHICH items, but as you can see in the icons next to each option as you select them, it shows slightly larger windows with content in them layed out so that there are no scrollbars etc. (it should work like "text zoom" feature that many browsers have [including Mozilla], and even if it resizes other elements like images or controls it should still let the page developer layout the page correctly to fit in the display and not show scrollbars and the content outside of the view)

You're practically f... up HTML standards like that. All websites fail to display correctly on people who have 125% DPI setting and there are many such people having that setting.

What other software have you seen behave like that? Don't you think other software makers (including Microsoft) know this setting that exists since Windows XP at least? Are they ignorant of that setting or are you just interpretting it wrong?

You can set the layout.css.devPixelsPerPx pref on the about:config page to 1.0 (current default value is -1.0) to restore the behavior of previous Firefox versions.

You can make further adjustments and start with a value of 1.0 and adjust this value with 0.1 steps or 0.05 for finer adjustments to make icons on the toolbars look right.

• Use values between 1.0 and about 0.5 to reduce elements in size (do NOT go all the way to 0.05!)
• Use values greater than 1.0 to magnify and make elements larger (percentage divided by DPI, % / DPI).

Use this extension to adjust the font size for the user interface.

• Theme Font & Size Changer: https://addons.mozilla.org/firefox/addon/theme-font-size-changer/

You can look at the Default FullZoom Level or NoScript extension if web pages need to be adjusted after changing the layout.css.devPixelsPerPx pref.

• Default FullZoom Level: https://addons.mozilla.org/firefox/addon/default-fullzoom-level/
• NoSquint: https://addons.mozilla.org/firefox/addon/nosquint/

• https://support.mozilla.org/kb/forum-response-Zoom-feature-on-Firefox-22

There is one word to describe this recent change in FF22 : "BROKEN"

It's broken, and all we get in the way of "help" is suggestions that we apply useless hacks that don't solve the underlying bug in the program.

The SOLUTION lies in fixing the BROKEN program, not complicating the problem by applying more hacks. Who decided to apply this "enhancement"? Why?

Moreover, this "fix" was supposed to be useful for people with large monitors and causes huge problem to people with small monitors (I use a lenovo S10-3t tablet PC) who were using 125% setting to get larger fonts (as the respective setting of Windows is supposed to be used for)

Mozilla devs could have made the text and images/buttons in the page bigger and let the page layout itself, but they thought they were more clever and just enlarged the pixel making the pages go out of the screen. Moreover when you press CTRL - to make page smaller, if you move to next page (on the same site/session!!!) it is larger again (hell)