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Such special icon are usually provided by a special icon font that it downloaded from the server, so make sure you allow downloadable fonts.

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

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block (wanted) content (Adblock Plus, NoScript, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block (wanted) content.

• make sure your extensions and filters are updated to the latest version
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems
• https://support.mozilla.org/en-US/kb/content-blocking

hi,

thanks for the reply.

I already have "Allow pages to choose their own fonts, instead of your selections above" ticked so it should already be doing that.

In regards to the "extensions" I don't have any installed?

Cheers

Paul

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block (wanted) content (Adblock Plus, NoScript, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block (wanted) content.

• make sure your extensions and filters are updated to the latest version
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Can you load any images from gstatic.com, such as the + that should appear on the Compose button:

https://www.gstatic.com/images/icons/material/colored_icons/1x/create_32dp.png

If you have a general problem with background colors and images, try this:

If your system uses a "High Contrast" theme, web pages may render in a simplified format without background colors/images that are essential in modern design. To rule that out, could you try setting Firefox to strictly follow page colors and see whether that makes any difference. Let us know what happens:

On the Options page:

• Windows: "3-bar" menu button (or Tools menu) > Options
• Mac: "3-bar" menu button (or Firefox menu) > Preferences
• Linux: "3-bar" menu button (or Edit menu) > Preferences
• Any system: type or paste about:preferences into the address bar and press Enter/Return to load it

In the search box at the top of the page, type color and Firefox should filter the page down so you can easily find the "Colors" button. Go ahead and click that.

Try changing this setting:

"Override the colors specified by the page with your selections above"

Below that, it usually says

"Only with High Contrast themes"

Click that and change the setting to

"Never"

then click OK to finish the change.

Does that help at all?

Here's a screenshot of that part of the Colors dialog as it appears on Windows 7: