Based on recent disclosures regarding Spectre and Meltdown vulnerabilities (A more detailed break-down of which can be found in this Register article), it is advisable to turn on process isolation in your web browser. The instructions for this can be found below.
Note that enabling this feature may interfere authentication on some sites. However in light of the severity of Spectre based exploits this seems a reasonable trade-off.
Chrome/Chromium based browsers and their derivatives
- On your computer, open Chrome.
- In the address bar at the top, enter
chrome://flags/#enable-site-per-processand press Enter.
- Next to 'Strict site isolation', click Enable.
- If you don't see 'Strict site isolation', update Chrome.
- Click Relaunch now.
replace step 2 with: vivaldi://flags/#enable-site-per-process
First-Party Isolation is not enabled by default in Firefox right now. One reason for that may be that the feature may interfere with the authentication system on some sites.
I suggest you try this out, and see if that is the case on your end. You can disable the security feature at any time to restore the status quo.
- Load the URL about:config?filter=privacy.firstparty.isolate in the Firefox address bar.
- Double-click on privacy.firstparty.isolate to set the preference to true.