In what way and where can't you search?

• searching via the location bar (pref: keyword.URL)
• search bar on the Navigation Toolbar
• search bar on the about:home page (pref: browser.search.defaultenginename)
• other search bar (e.g. added by extension)

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 or otherwise make changes.

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

Thanks for your reply! Strange, I can search through the title bar but not the search box. In safe mode I can search through both. Searching through the title bar is fine for now.

If it works in Safe Mode or with all extensions (Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.

Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: "Firefox > Quit Firefox"; Linux: "Firefox/File > Quit")

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