Try to set layout.css.devPixelsPerPx to 1.0 (default is -1) on the about:config page. If necessary adjust its value in 0.1 or 0.05 steps (1.1 or 0.9) until icons or text looks right.

You can look at the Default FullZoom Level or NoSquint extension to set a default font size and page zoom on web pages.

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

What a reply! Are you serious?? So I buy some praised car (let's say a Mitsubishi) and they deliver it to me without a windscreen. Then they say: If you want, you can mount the windscreen you might find in the trunk. Or you can buy one from the auto part shop! What sort of modern thinking is that? Why can't the developers just solve the problem instead of users trying to find patches or workarounds on their own?

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

• Use a compressed image type like PNG or JPG to save the screenshot
• Make sure that you do not exceed the maximum size of 1 MB

If this only happens on one particular page then you may have zoomed that page. If the entire browser is affected then something else is wrong.

Are we speaking here as computer specialists with decades of experience? Or like toddlers? I couldn't have been clearer than that. On opening Firefox first time after installation, everything shown on its screen is significantly bigger then in the other browsers. The attached pic shows what happens: you can see the same page on Chrome, Maxthon and Firefox, in that order, with the default 100% zoom. Also Edge acts normal like Chrome and Maxthon. Only Firefox shows the huge content. To make Firefox show things correctly, I have to use the 80% zoom.

I wanted to see if both the user interface and website content is affected.

As the user interface appears to be affected as well then you should try to set layout.css.devPixelsPerPx to 1.0 as there is likely something wrong with the DPI setting that Firefox detects from the OS.

I don't know what screen dimensions you have or what the DPI setting in Windows is.

The picture clearly shows that the interface is not affected. The texts and the icons are the same dimensions as for the other browsers. My screen resolution is 1920 x 1080 (a 23 inch monitor), but that doesn't influence the other browsers. So, the big question is: How come all the other famous browsers get it all right, but Firefox doesn't??

This Firefox makes it difficult to even find the Help command and so the version number. It is 42.0.

sorin86 said

To make the view as reasonable as on the other browsers I have to set Firefox to 80%!

That implies that your Windows text size setting is 125% (80% x 125% = 100%). By default, Firefox follows the Windows text size setting instead of using the traditional 96dpi.

If that doesn't work for your eyes, you can use one of the two extensions cor-el listed to set a new default zoom level for the content area.

That also implies that Firefox is the only mainstream browser that cannot do this job right. It doesn't work for my eyes and it doesn't work for our profession. If any developer is reading this, please try to be more professional and correct this ridiculous and embarrassing bug.

Hi sorin86, to give suggestions for feature changes, you can use this page:

https://input.mozilla.org/feedback/firefox

But... I don't really expect a change. High DPI support was introduced in Firefox 22, and the issue of having a single size size setting for both the browser chrome (menus, toolbars, dialogs) and site content has continued since that time. When setting priorities, Mozilla considers the availability of effective add-ons to customize content for users, and since there are at least two, that may explain the situation.