Reset the page zoom on pages that cause problems.

• View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)

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

If you have increased the minimum font size then try the default setting "none" in case the current setting is causing problems.

• Tools > Options > Content : Fonts & Colors > Advanced > Minimum Font Size (none)

Make sure that you allow websites to choose their fonts.

• Tools > Options > Content : Fonts & Colors > Advanced > [X] "Allow pages to choose their own fonts, instead of my selections above"

• https://support.mozilla.org/kb/Changing+fonts+and+colors

It is better not to increase the minimum font size, but use an extension to set the default page zoom to prevent issues with overlapping text.

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

Thanks for the help I am half way there Where should I download the links?

What do you mean with Where should I download the links ?

Are you referring to an extension?

• https://support.mozilla.org/kb/customize-firefox-with-add-ons-plugins-and-extensions

You can use an 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/

Sorry Co-rel I realized as I posted they were links which I am now using. Thanks so much for the help problem solved. Kind regards quasi

You're welcome and glad that you've solved it.