Closed Bug 1486303 Opened 2 years ago Closed 1 year ago
Lastpass severely slows down open new tab perf
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0 Build ID: 20180823220048 Steps to reproduce: [ (20 items) ].forEach(url => window.open(url, _blank)); Actual results: Takes 10 seconds to open with Lastpass Addon enabled. Takes 1 seconds to open with Lastpass Addon disabled. Expected results: Similar performance with Lastpass addon on or off.
Could you please provide some clearer steps to try to reproduce this issue? Thanks.
1. Open the developer console (F12) on any non-blank page. 2. Paste in: [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20].forEach(url => window.open('https://www.msn.com/?id=' + url, '_blank'); When LastPass addon is enabled, opening tabs is visibly much slower. When LastPass addon is disabled (via about:addons), opening tabs is very quick. Attempt the above steps in private browsing mode for more drastic effects: you can see flashing purple with a lot of delay when LastPass addon is enabled, while the flashing purple is much quicker when the addon is disabled.
Sorry, the code should read: [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20].forEach(url => window.open('https://www.msn.com/?id=' + url, '_blank'));
Thanks for the details. I reproduced this issue on Firefox 61.0.2, Firefox 62.0b20 and on Firefox Nightly 63.0a1 on Windows 10 x 64.
Component: Add-ons → General
Product: Tech Evangelism → WebExtensions
Status: NEW → RESOLVED
Closed: 1 year ago
Resolution: --- → WORKSFORME
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