error Rated 2 out of 5 stars

I get this error with firefox nightly

SyntaxError: test for equality (==) mistyped as assignment (=)? instantfox.js:364:45
SyntaxError: test for equality (==) mistyped as assignment (=)? instantfox.js:1074:48
SyntaxError: test for equality (==) mistyped as assignment (=)? contextMenu.js:136:45
SyntaxError: octal literals and octal escape sequences are deprecated instantfoxModule.js:392:43
ReferenceError: assignment to undeclared variable EXPORTED_SYMBOLS instantfoxModule.js:9:0
ReferenceError: assignment to undeclared variable searchEngineObserver instantfoxModule.js:487:4
ReferenceError: assignment to undeclared variable InstantFoxModule instantfoxModule.js:711:4
ReferenceError: assignment to undeclared variable getBundle instantfoxModule.js:1289:0
ReferenceError: assignment to undeclared variable checkVersion instantfoxModule.js:1322:0
Warning: attempting to write 4241 bytes to preference extensions.xpiState. This is bad for general performance and memory usage. Such an amount of data should rather be written to an external file.
fetchAsync is too slow instantfoxModule.js:329:0
ReferenceError: reference to undefined property this.Shortcuts[key] instantfoxModule.js:703:8
ReferenceError: assignment to undeclared variable EXPORTED_SYMBOLS defaultPluginList.js:7:0
ReferenceError: assignment to undeclared variable InstantFoxPluginList defaultPluginList.js:8:0
ReferenceError: reference to undefined property commonPlugins[i] defaultPluginList.js:916:2
ReferenceError: assignment to undeclared variable preprocessRawData defaultPluginList.js:1045:0
ReferenceError: assignment to undeclared variable getString defaultPluginList.js:1088:0
ReferenceError: assignment to undeclared variable getData defaultPluginList.js:1091:0
ReferenceError: reference to undefined property this.logoAdded instantfox.js:603:0
ReferenceError: reference to undefined property e.target.nodeName overlay.js:95:0
No chrome package registered for chrome://instantfox/content/overlay.js

This review is for a previous version of the add-on (2.9.11.1-signed). 

Rated 1 out of 5 stars

doesn't work.
But now i have at least a replacement Context Search X

This review is for a previous version of the add-on (2.8.9.1-signed).