When scrolling the page, the first texts (in grey) become really hard to read on the background (using Firefox on Mac OS X) and I had to select the text to read

When scrolling the page, the first texts (in grey) become really hard to read on the background (using Firefox on Mac OS X) and I had to select the text to read it properly. It displays fine on the white parts of the background but I have the habit to scroll to have the text I'm reading on top and here it overlays with your chairs in background