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Bug 1519586 - Fix js error in browser_aboutdevtools_reuse_existing.js r=ladybenko

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Differential Revision: https://phabricator.services.mozilla.com/D44345

--HG--
extra : moz-landing-system : lando
This commit is contained in:
Julian Descottes 2019-09-02 15:22:37 +00:00
parent 19972acbe5
commit 17ae774116
1 changed files with 6 additions and 2 deletions
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8
devtools/startup/aboutdevtools/test/head.js
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@ -104,6 +104,10 @@ function synthesizeToggleToolboxKey() {
*/
function isAboutDevtoolsTab(tab) {
const browser = tab.linkedBrowser;
const location = browser.documentURI.spec;
return location.startsWith("about:devtools");
// browser.documentURI might be unavailable if the tab is loading.
if (browser && browser.documentURI) {
const location = browser.documentURI.spec;
return location.startsWith("about:devtools");
}
return false;
}