Hmm, I think 2.0 would be okay, since that means 200%. Maybe you entered 0.2, or 20%?

Assuming you still have the about:config page open, can you try zooming it by holding down the Ctrl key and tapping + numerous times? This may make it barely readable enough to right-click layout.css.devPixelsPerPx and choose the last item on the context menu, which is Reset (or you can right-click and tap the r key to activate that item).

Does that work?

If that doesn't work, and you haven't invested too much time in customizing Firefox yet, you could use the Refresh feature to reset your settings back to their defaults.

From inside Firefox, you'll use the Help menu > Restart with Add-ons disabled. To do that "blind" tap the Alt key on the keyboard, then H to activate the Help menu, then R to activate the restart.

A dialog should appear asking you to confirm. Click the Restart button or press the Enter key to activate it.

A small dialog should appear, hopefully in a more normal size. Click "Refresh" and approve the changes listed in the next dialog to proceed.

Does that work?

You can also go to the Firefox profile folder and edit the prefs.js file and change the value of layout.css.devPixelsPerPx to 1.0 or -1.0

• C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>\

"AppData" (XP: Application Data; Mac: ~/Library; Linux: ~/.mozilla) is a hidden folder.

• http://kb.mozillazine.org/Show_hidden_files_and_folders

Windows hides some file extensions by default. Among them .html and .ini and .js and .txt and you may only see a file name without file extension. You can check the file extension (type) in the properties of the file in Windows Explorer via the right-click context menu.

I'm sorry everyone that is trying to help, but remember, I can't see anything on the firefox screen but a line the size of a pencil mark. I have tried the ctrl-+ thing to no avail. I cant see to do anything with the toolbox. It just isnt there. Nothing will even highlight when I try hi hovering. The about:config page is not open and I can't find the "layout...." menu. I can't see what I am typing now, so I hope you can read this. Thank you so much for trying to help. I don't know what to do. I am not very good at this tech stuff, but i will try to do anything suggested. Thanks again

Close Firefox using Alt+F4 or if Vista had this, right-click its icon on the Windows Taskbar and choose Close All Windows.

Next, select and copy (Ctrl+c) the following:

firefox.exe -P

Click the start menu icon then paste into the search box and press Enter to run that. Firefox should open its Profile Manager.

Don't delete anything here!

Click the Create Profile button, assign a name like Feb2016, and skip the option to relocate the profile folder. After creating the profile, select it and start Firefox in that profile.

You should be up and running.

Do you need anything from the original profile? Bookmarks, passwords, anything? If not, you're good to go.

Hi. I will try this. I do wish I wouldn't lose my bookmarks though. Need them pretty badly.

Jsher, the alt f4 only gives the option of shutting down. No other option

bil75 said

Jsher, the alt f4 only gives the option of shutting down. No other option

Shutting down Windows? Make sure Firefox is the active application when you press that key combination.

bil75 said

I do wish I wouldn't lose my bookmarks though. Need them pretty badly.

Okay, we'll do that. Again, make sure not to delete your original profile when creating the new one.

I wish the about:config would come up with just the "layout..." list. Then maybe I could find it and scroll down to the bottom and try and see 'reset' like you suggesteed. But I can't find the 'layout' menu at all. It just has a bunch of options to choose from to get to 'layout'

bil75 said

I wish the about:config would come up with just the "layout..." list. Then maybe I could find it and scroll down to the bottom and try and see 'reset' like you suggesteed.

If you cannot read right-click context menus because they are too small, then you won't be able to use that method.

Also, the about:config page does have a search box at the top and you could use that to filter the list, but it's probably too small to click into or see what you're typing with your current settings.

I can't use alt f4. Just shuts down windows. Is there some way or some option on the mozilla icon when I right click and choose properties? Is there some way to reset it?

Well, is Firefox closed now? The point of using Alt+F4 is it closes the active application. If Firefox is now completely closed, you can move on to the next step.

If you want to try a refresh:

Hold down the Shift key while starting up Firefox again.

A small dialog should appear, hopefully in a more normal size. Click "Refresh" and approve the changes listed in the next dialog to proceed.

Does that work?

Note: if you just get a new Firefox window instead of the Safe Mode/Refresh dialog, try this sequence of keys to completely exit Firefox while that new window is active (press and release in this order):

Alt f x

I held down the shift key and clicked to open firefox. A tiny box opens with two little boxes on the bottom right. I can't rread what the boxes say. Could you tell me which box to choose for the reset?

According to our help article on Safe Mode, it's the one on the right:

OK When the litle box came up with the two tiny boxes I clicked on the one on the right. Then another little box comes up with the title 'Refresh Firefox' and has two more boxes on the right bottom that , I guess , has two more choices. Which on of these do I click on? Gees

This time it's the one on the left:

jscher!! You did it!!! I am so happy!! It came up with my favorites and everything that I had put in it and it is regular size now. The only thing I have trouble with , (and that's how I got into this mess) is that the whole Mozilla page is just too large. It covers my whole screen and I have to scroll to see all of the page. Oh well. Thank you sooooooo much. You made my day a happy one!!

Maybe instead of using the about:config change, you could use one of these extensions to reduce the default zoom level globally (this is an old list, so I don't know for sure that these still work):

• Default FullZoom Level
• Zoom Page (includes "fit to window" feature)
• NoSquint

After setting your global or default zoom level, you can still fine-tune the zoom on individual sites using Firefox's standard zoom feature (keyboard shortcut or mouse wheel).