Recent answers to Constant JavaScript 'Syntax error' notification after upgrading to 17.0https://support.mozilla.org/en-US/questions/9423312013-01-16T13:30:05-08:00I had this problem on 17.x and 18.0; adblock plus didn't seem to be the problem, since alternately e2013-01-16T13:30:05-08:00yrt8476https://support.mozilla.org/en-US/questions/942331?page=2#answer-398686<p>I had this problem on 17.x and 18.0; adblock plus didn't seem to be the problem, since alternately enabling and disabling everything for FB didn't help.
</p><p>Per the advice elsewhere on this thread, updating Social Fixer (which wasn't showing up at all on FB, so I had assumed that I'd already disabled it on this laptop and it couldn't be the problem) solved the problem. You can find the most current version at <a href="http://socialfixer.com/" rel="nofollow">http://socialfixer.com/</a> .
</p>"Disable JavaScript only affects web pages". OK, got it now - that isn't clear from the options/add2012-12-20T07:20:37-08:00MaryXYXhttps://support.mozilla.org/en-US/questions/942331?page=2#answer-390522<p>"Disable JavaScript only affects web pages". OK, got it now - that isn't clear from the options/add-ons/plugins pages. I might have forgotten to restart on some occasions too.
</p><p>Upgrading Social Fixer from 6.6 to 7.3 seems to have solved the problem on all VMs and hardware systems that have Social Fixer on them. If I can reproduce the problem on a VM without it I'll go one add-on or plugin at a time and try to find another culprit.
</p><p>Postscript: I have not been able to demonstrate another culprit, so I'll stick with the "Social Fixer v6" explanation.
</p>If you disable JavaScript via "Firefox > Options" then that only effect JavaScript used on web pa2012-12-19T16:17:01-08:00cor-elhttps://support.mozilla.org/en-US/questions/942331?page=2#answer-390260<p>If you disable JavaScript via "Firefox &gt; Options" then that only effect JavaScript used on web pages, but it has no effect on extensions and internal Firefox JavaScript files.
</p><p>You will have to click the Disable button next to each extension on the Tools &gt; Add-ons &gt; Extensions (about:addons) page and close and restart Firefox.
</p>
<hr>
<p>If it works in Firefox Safe-mode then disable all extensions (Tools &gt; Add-ons &gt; Extensions) and then try to find which is causing it by enabling one extension at a time until the problem reappears.
</p><p>Close and restart Firefox after each change via "File &gt; Exit" (Mac: "Firefox &gt; Quit"; Linux: "File &gt; Quit")
</p>
<ul><li><a href="https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes" rel="nofollow">https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes</a>
</li></ul>@Maryxxx. Hopefully, I am sure Mozilla support will answer your question better than I can. My under2012-12-19T07:18:14-08:00eswebhttps://support.mozilla.org/en-US/questions/942331?page=2#answer-390188<p>@Maryxxx. Hopefully, I am sure Mozilla support will answer your question better than I can. My understanding is that Safe Mode only prevails for your current session. If you restart Firefox, it starts in normal mode.
</p><p>If you still have the problem after disabling all the add-ons, I suggest you also disable the Extensions as I described in my earlier post. This is how I was able to isolate which extension caused the problem.
</p>Just to add an extra detail. I still get just as many Java Script errors if I disable Java Script.
2012-12-19T06:46:42-08:00MaryXYXhttps://support.mozilla.org/en-US/questions/942331?page=2#answer-390176<p>Just to add an extra detail. I still get just as many Java Script errors if I disable Java Script.
</p>I've recently started having this problem on a system which does not have Social Fixer. What is the2012-12-18T22:53:17-08:00MaryXYXhttps://support.mozilla.org/en-US/questions/942331?page=2#answer-390074<p>I've recently started having this problem on a system which does not have Social Fixer. What is the difference between restarting in Safe Mode and disabling add-ons? If I restart in Safe Mode I don't have the problem, but if I disable all add-ons I still do.
</p><p>How do you re-enable add-ons in Safe Mode? As I understand it, all add-ons are completely disabled until the next restart.
</p>I had an gmail third-party extension that caused the Javascript syntax error.
This is how I tracked 2012-12-06T12:25:02-08:00eswebhttps://support.mozilla.org/en-US/questions/942331?page=2#answer-386968<p>I had an gmail third-party extension that caused the Javascript syntax error.
This is how I tracked it down in amongst all the other addons.
1. Go Start and enter Run.
2. Enter -firefox -same-mode.
3. On the dialog box displayed, click OK and Firefox will start in Safe Mode.
4. Check if the problem has disappeared.
5. If not, in Firefox go Tools &gt; Options. .
6. On the General tab, click the Manage Add-Ons.
7. Disable all the add-ons, restart Firefox to see if problem fixed (in my case it did not fix the problem. If the problem has been fixed, progressively enable the add-ons until you find which one caused the problem.
8. On the window displayed when you click Manage Add-Ons, select Extensions in the left-hand menu.
9. Do as above and disable all the extensions.
10. My guess is that the problem should now have disappeared.
11. Finally, progressively enable 2-3 extension until you have isolated which one has caused the problem.
</p><p>IMPORTANT. After each enable/disable operation, you needto restart Firefox.
</p>You only get this 'Error: Syntax error' from JavaScript application notification if you have an exte2012-12-06T08:43:25-08:00cor-elhttps://support.mozilla.org/en-US/questions/942331?page=2#answer-386909<p>You only get this <i>'Error: Syntax error' from JavaScript application</i> notification if you have an extension installed that isn't working properly and is responsible for this error.<br>
There is no need to install an extension.
</p><p>Other extensions may be causing a similar error to appear, so check that if you do not have the Social Fixer extension.
</p>
<ul><li><a href="https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes" rel="nofollow">https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes</a>
</li></ul>http://socialfixer.com/ just choose the browser you use and it'll download the application
2012-12-06T08:10:55-08:00edzzedhttps://support.mozilla.org/en-US/questions/942331?page=2#answer-386889<p><a href="http://socialfixer.com/" rel="nofollow">http://socialfixer.com/</a> just choose the browser you use and it'll download the application
</p>I don't know what is this App the "google social fixer". Where can I download it from where?
2012-12-06T06:15:45-08:00nogueira13https://support.mozilla.org/en-US/questions/942331?page=2#answer-386842<p>I don't know what is this App the "google social fixer". Where can I download it from where?
</p>google social fixer 7.3 and download it. fixed the problem for me as well.
2012-12-05T11:15:53-08:00edzzedhttps://support.mozilla.org/en-US/questions/942331#answer-386556<p>google social fixer 7.3 and download it. fixed the problem for me as well.
</p>Ok, and I discovered that the extension that was producing the error message was "Linkify (for Micro2012-12-04T08:44:03-08:00nogueira13https://support.mozilla.org/en-US/questions/942331#answer-386307<p>Ok, and I discovered that the extension that was producing the error message was "Linkify (for Microsoft Lync) 1.0. I I excluded it and I didn't receive the error message longer.
Thanks for the help. Very very thanks.
Antonio Carlos.
</p>With all plug ins disabled, you can add them back one by one. Restart when needed. Continue this pro2012-12-04T07:16:59-08:00DriftMGRhttps://support.mozilla.org/en-US/questions/942331#answer-386291<p>With all plug ins disabled, you can add them back one by one. Restart when needed. Continue this process until you find the non-compatible plug-in.
</p>I changed to Safe Mode and It solved the problem. But how can I discover wich plugin (or plugins) or2012-12-04T06:16:45-08:00nogueira13https://support.mozilla.org/en-US/questions/942331#answer-386281<p>I changed to Safe Mode and It solved the problem. But how can I discover wich plugin (or plugins) or extension is causing the problem?
thanks in advance.
</p>Same problem (and solution) here with the syntax errors happening not only on facebook, but other si2012-11-27T20:47:44-08:00jeltzhttps://support.mozilla.org/en-US/questions/942331#answer-384561<p>Same problem (and solution) here with the syntax errors happening not only on facebook, but other sites like IMBD etc.
</p><p>Social fixer was the problem and updating it resolved the issue, the version available via the Add-ons Manager is still the old one but the version available from the <a href="http://socialfixer.com" rel="nofollow">socialfixer.com</a> is working fine.
</p><p>@ summertime, FWIW I'm using ABP without issue.
</p><p>Thanks people.
</p>Social Fixer was the culprit in my case. The problem has been fixed in their version 7.3.
2012-11-25T07:32:02-08:00eyereaderhttps://support.mozilla.org/en-US/questions/942331#answer-383895<p>Social Fixer was the culprit in my case. The problem has been fixed in their version 7.3.
</p>46 views and 0 answers on the Adblock Plus forum :-(
2012-11-23T15:18:11-08:00summertimehttps://support.mozilla.org/en-US/questions/942331#answer-383444<p>46 views and 0 answers on the Adblock Plus forum&nbsp;:-(
</p>Hi summertime
Try to ask advice at the Adblock Plus forum.
https://adblockplus.org/forum/
2012-11-22T12:47:19-08:00cor-elhttps://support.mozilla.org/en-US/questions/942331#answer-383172<p>Hi summertime
</p><p>Try to ask advice at the Adblock Plus forum.
</p>
<ul><li><a href="https://adblockplus.org/forum/" rel="nofollow">https://adblockplus.org/forum/</a>
</li></ul>Now my Adblock isn't working anymore. Groan. That has always been one of my favorite things about Fi2012-11-22T12:38:14-08:00summertimehttps://support.mozilla.org/en-US/questions/942331#answer-383170<p>Now my Adblock isn't working anymore. Groan. That has always been one of my favorite things about Fire Fox. No ads. Any advice on how to get Adblock working again?
</p>Ok, so it turns out that for me it really was socialfixer. There was an upgrade on Tuesday and I ju2012-11-22T10:36:08-08:00MissM007https://support.mozilla.org/en-US/questions/942331#answer-383144<p>Ok, so it turns out that for me it really was socialfixer. There was an upgrade on Tuesday and I just found out about it today. All better for me. &nbsp;:)
</p>