It’s increasingly becoming a Google Chrome online world, even for Mac users.

Microsoft’s and Mozilla’s browsers fell to new lows in July as users continued to switch to Google’s behemoth, Chrome, which again looks unstoppable.

According to California-based analytics vendor Net Applications, Microsoft’s Internet Explorer (IE) and Edge dropped to a combined user share of 15.4% last month, down a whopping 3.8 percentage points from June. Meanwhile, Mozilla’s Firefox cast off a much smaller two-tenths of a percentage point, recording a user share of 9.7%. Microsoft’s July number was a record low in Computerworld‘s tracking of browser data, which began in 2005. Firefox’s figure was its smallest user share since February 2006, when it was fighting for the scraps left by the then-dominant IE.

Net Applications calculates user share by detecting the agent strings of the browsers people use to visit their clients’ websites. It then tallies the visitor sessions – which are effectively visits to the site, with multiple sessions possible daily – rather than count only users, as it once did. Net Applications primarily measures activity, although it does so differently than rival sources, which total page views.

Microsoft’s and Mozilla’s browser problems are not new: Both companies have watched their once-substantial user share shrink over the last decade.

A long downhill slide

Microsoft’s troubles appeared direr, as its IE and Edge have shown few signs of stanching their continued losses. With very few exceptions – notably in June, which in hindsight now looks to have been a miscount by Net Applications – IE and Edge have shed share month after month after month. Of the past 24 months, for example, IE and Edge lost share in 19. In the last year, the IE-and-Edge user share dropped by 6.8 percentage points, a 31% decline from the July 31, 2017 mark.

Firefox was in a leaky boat, too. July was the third consecutive month in which Mozilla’s open-source browser posted a number under the 10% bar. In the past year, Firefox has lost 2.6 percentage points, or 21% of its July 31, 2017, user share.

Losses like Microsoft’s and Mozilla’s are unsustainable.