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I asked on another Forum about changing the styles without having access to the CSS style sheets and Firefox's Extension Stylus was recommended.

Easy to install, click the Stylus icon and select "Write style for this URL".

A textarea box appears and I inserted the following:

Code:

.cposts2 div {
    font: 16px/1.42 BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-weight: normal;
    background-color: #fff; color: #333;
    font-size: 1.02em;
}

Followed by Save in the left-hand column and it works a treat...

and it still works once Firefox has been closed and reopened - magic