Can you provide a screen shot of the screen with this issue.

It took me a bit to figure out how to do a screen shot in Linux Mint, the Print Screen button doesn't work. Anyway, while doing that, the problem briefly disappeared. Re-started the computer, and it's back.

Here's the screen shot.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

As I said in my first post, I already tried Safe Mode with no change.

FF is in Default appearance mode.

Edit: I've just discovered if I use a link in a page, and then the back button, the url in the address bar is normal in the previous page. Refreshing a page does not change anything.

I have the same problem with a new version installed on lubuntu 14.04, then I installed various complete themes and all the same, but with one theme the problem was solved, the theme is FXChrome and the probem with de urls' was solved, I think that is causing the problem is the new australis theme

Thanks jorgelucho! The FXChrome theme fixed it.

With the other problems I've been recently having with Firefox I think I'll just use Chrome, rather than the look alike FF.

SOLVED on my old pentium M laptop running Lubuntu 14.04

To fix in Firefox 29:

• type about:config[Enter]

• Promise to be careful

• In the Search Bar type gfx.xrender.enabled

• Right-click (F12) and Toggle to make it false

• Exit Firefox. Open Firefox again.

Source: Comment #11 in the following bug report https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1316250