This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Gibberish appearing in AOL & Yahoo email, not in gmail. Started after FFox 60 update.

  • 9 ŋuɖoɖowo
  • 1 masɔmasɔ sia le esi
  • 3 views
  • Nuɖoɖo mlɔetɔ fives

more options

Gibberish appearing in AOL & Yahoo email, not in gmail. Started after FFox 60 update. Does not appear in other browsers. Did not appear in FFox before 60. Have not updated or otherwise changed any hardware or software recently before or after FFox automatically updated itself couple days ago. Images are attached. Couple years back this was happening in Safari and Chrome but not FFox. That is why I switched to FFox. Since later upgrades, Safari & Chrome no longer display gibberish. All forums I went to had no answers not even tech support. So I stayed with FFox. Don't care to go back. Has always performed smoothly. But if this new glitch isn't fixed very shortly, I'll go back to them. Going forward with new upgrade only to go backward with text displays. Any suggestions or solutions are welcome... thanks much

Gibberish appearing in AOL & Yahoo email, not in gmail. Started after FFox 60 update. Does not appear in other browsers. Did not appear in FFox before 60. Have not updated or otherwise changed any hardware or software recently before or after FFox automatically updated itself couple days ago. Images are attached. Couple years back this was happening in Safari and Chrome but not FFox. That is why I switched to FFox. Since later upgrades, Safari & Chrome no longer display gibberish. All forums I went to had no answers not even tech support. So I stayed with FFox. Don't care to go back. Has always performed smoothly. But if this new glitch isn't fixed very shortly, I'll go back to them. Going forward with new upgrade only to go backward with text displays. Any suggestions or solutions are welcome... thanks much
Screen ƒe photowo kpe ɖe eŋu

Ŋuɖoɖo si wotia

< You can set this pref to 2 or 1 on the about:config page to lower the sandbox security setting. >

Hallelujah!!! Magic '1' worked. Big thanks Cor-el ! AOL & Yahoo normal. Haven't tried various sites yet but presuming all is back to normal.

Also praying for restorations in your life and others in this thread who made the effort for solutions.

Xle ŋuɖoɖo sia le goya me 👍 0

All Replies (9)

more options

Type about:preferences#content<enter> in the address bar. Across from fonts and colors, press the Advanced button. On the bottom, turn on Allow Web Sites To Choose Their Own.

Fonts Information - Detected via Flash http://browserspy.dk/fonts-flash.php?detail=1

more options

hi, are you using any third-party font managers on the affected system?

philipp trɔe

more options

< Type about:preferences#content<enter> in the address bar. Across from fonts and colors, press the Advanced button. On the bottom, turn on Allow Web Sites To Choose Their Own. >

thanks Fred, but this was already selected by default. So must be another fix.

more options

< are you using any third-party font managers on the affected system? >

Philipp - Yes. Using Suitcase Fusion which is updated for my OS - Yosemite. Same SF version which worked fine with previous FFox version. Being a graphic designer, a font management program is basically vital. thanks

more options

< Type about:preferences#content<enter> in the address bar. Across from fonts and colors, press the Advanced button. On the bottom, turn on Allow Web Sites To Choose Their Own. >

Even though this selection is checked by default, I'm still seeing this on some websites (attached)

more options

thanks, we're tracking the problem in https://bugzilla.mozilla.org/show_bug.cgi?id=1460917

as a workaround in the meantime you could try the following: enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named security.sandbox.content.level. double-click it and change its value to 2 and restart firefox once.

more options

< as a workaround in the meantime you could try the following: enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named security.sandbox.content.level. double-click it and change its value to 2 and restart firefox once. >

thanks philipp. Unfortunately no go. Remains same gibberish. Should I change value back to 3? Thanks for tracking problem.

more options

You can try 1 for the value of the pref like the user reported in this thread.


You can set this pref to 2 or 1 on the about:config page to lower the sandbox security setting.

  • security.sandbox.content.level = 1
  • close and restart Firefox to make the change effective.

If '1' still doesn't have effect then try '0' to disable the sandbox.

If this didn't work then undo/reverse the change and reset the pref via the right-click context menu to the default value.

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

more options

Ɖɔɖɔɖo si wotia

< You can set this pref to 2 or 1 on the about:config page to lower the sandbox security setting. >

Hallelujah!!! Magic '1' worked. Big thanks Cor-el ! AOL & Yahoo normal. Haven't tried various sites yet but presuming all is back to normal.

Also praying for restorations in your life and others in this thread who made the effort for solutions.